155 lines
12 KiB
HTML
155 lines
12 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Links and flowing text</title>
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<link type="text/css" rel="stylesheet" href="../fpdf.css">
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</head>
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<body>
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<h1>Links and flowing text</h1>
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This tutorial explains how to insert links (internal and external) and shows a new text writing
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mode. It also contains a basic HTML parser.
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<div class="source">
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<pre><code><?php
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<span class="kw">require(</span><span class="str">'fpdf.php'</span><span class="kw">);
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class </span>PDF <span class="kw">extends </span>FPDF
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<span class="kw">{
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protected </span>$B <span class="kw">= </span>0<span class="kw">;
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protected </span>$I <span class="kw">= </span>0<span class="kw">;
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protected </span>$U <span class="kw">= </span>0<span class="kw">;
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protected </span>$HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
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function </span>WriteHTML<span class="kw">(</span>$html<span class="kw">)
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{
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</span><span class="cmt">// HTML parser
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</span>$html <span class="kw">= </span>str_replace<span class="kw">(</span><span class="str">"\n"</span><span class="kw">,</span><span class="str">' '</span><span class="kw">,</span>$html<span class="kw">);
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</span>$a <span class="kw">= </span>preg_split<span class="kw">(</span><span class="str">'/<(.*)>/U'</span><span class="kw">,</span>$html<span class="kw">,-</span>1<span class="kw">,</span>PREG_SPLIT_DELIM_CAPTURE<span class="kw">);
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foreach(</span>$a <span class="kw">as </span>$i<span class="kw">=></span>$e<span class="kw">)
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{
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if(</span>$i<span class="kw">%</span>2<span class="kw">==</span>0<span class="kw">)
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{
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</span><span class="cmt">// Text
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</span><span class="kw">if(</span>$<span class="kw">this-></span>HREF<span class="kw">)
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</span>$<span class="kw">this-></span>PutLink<span class="kw">(</span>$<span class="kw">this-></span>HREF<span class="kw">,</span>$e<span class="kw">);
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else
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</span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$e<span class="kw">);
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}
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else
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{
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</span><span class="cmt">// Tag
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</span><span class="kw">if(</span>$e<span class="kw">[</span>0<span class="kw">]==</span><span class="str">'/'</span><span class="kw">)
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</span>$<span class="kw">this-></span>CloseTag<span class="kw">(</span>strtoupper<span class="kw">(</span>substr<span class="kw">(</span>$e<span class="kw">,</span>1<span class="kw">)));
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else
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{
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</span><span class="cmt">// Extract attributes
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</span>$a2 <span class="kw">= </span>explode<span class="kw">(</span><span class="str">' '</span><span class="kw">,</span>$e<span class="kw">);
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</span>$tag <span class="kw">= </span>strtoupper<span class="kw">(</span>array_shift<span class="kw">(</span>$a2<span class="kw">));
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</span>$attr <span class="kw">= array();
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foreach(</span>$a2 <span class="kw">as </span>$v<span class="kw">)
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{
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if(</span>preg_match<span class="kw">(</span><span class="str">'/([^=]*)=["\']?([^"\']*)/'</span><span class="kw">,</span>$v<span class="kw">,</span>$a3<span class="kw">))
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</span>$attr<span class="kw">[</span>strtoupper<span class="kw">(</span>$a3<span class="kw">[</span>1<span class="kw">])] = </span>$a3<span class="kw">[</span>2<span class="kw">];
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}
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</span>$<span class="kw">this-></span>OpenTag<span class="kw">(</span>$tag<span class="kw">,</span>$attr<span class="kw">);
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}
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}
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}
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}
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function </span>OpenTag<span class="kw">(</span>$tag<span class="kw">, </span>$attr<span class="kw">)
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{
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</span><span class="cmt">// Opening tag
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</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
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</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>true<span class="kw">);
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if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
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</span>$<span class="kw">this-></span>HREF <span class="kw">= </span>$attr<span class="kw">[</span><span class="str">'HREF'</span><span class="kw">];
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if(</span>$tag<span class="kw">==</span><span class="str">'BR'</span><span class="kw">)
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</span>$<span class="kw">this-></span>Ln<span class="kw">(</span>5<span class="kw">);
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}
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function </span>CloseTag<span class="kw">(</span>$tag<span class="kw">)
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{
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</span><span class="cmt">// Closing tag
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</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
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</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>false<span class="kw">);
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if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
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</span>$<span class="kw">this-></span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
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}
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function </span>SetStyle<span class="kw">(</span>$tag<span class="kw">, </span>$enable<span class="kw">)
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{
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</span><span class="cmt">// Modify style and select corresponding font
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</span>$<span class="kw">this-></span>$tag <span class="kw">+= (</span>$enable <span class="kw">? </span>1 <span class="kw">: -</span>1<span class="kw">);
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</span>$style <span class="kw">= </span><span class="str">''</span><span class="kw">;
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foreach(array(</span><span class="str">'B'</span><span class="kw">, </span><span class="str">'I'</span><span class="kw">, </span><span class="str">'U'</span><span class="kw">) as </span>$s<span class="kw">)
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{
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if(</span>$<span class="kw">this-></span>$s<span class="kw">></span>0<span class="kw">)
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</span>$style <span class="kw">.= </span>$s<span class="kw">;
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}
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</span>$<span class="kw">this-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span>$style<span class="kw">);
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}
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function </span>PutLink<span class="kw">(</span>$URL<span class="kw">, </span>$txt<span class="kw">)
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{
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</span><span class="cmt">// Put a hyperlink
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</span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">,</span>0<span class="kw">,</span>255<span class="kw">);
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</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>true<span class="kw">);
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</span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$txt<span class="kw">,</span>$URL<span class="kw">);
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</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>false<span class="kw">);
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</span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">);
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}
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}
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</span>$html <span class="kw">= </span><span class="str">'You can now easily print text mixing different styles: <b>bold</b>, <i>italic</i>,
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<u>underlined</u>, or <b><i><u>all at once</u></i></b>!<br><br>You can also insert links on
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text, such as <a href="http://www.fpdf.org">www.fpdf.org</a>, or on an image: click on the logo.'</span><span class="kw">;
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</span>$pdf <span class="kw">= new </span>PDF<span class="kw">();
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</span><span class="cmt">// First page
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</span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
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</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">'Arial'</span><span class="kw">,</span><span class="str">''</span><span class="kw">,</span>20<span class="kw">);
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</span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">"To find out what's new in this tutorial, click "</span><span class="kw">);
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</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span><span class="str">'U'</span><span class="kw">);
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</span>$link <span class="kw">= </span>$pdf<span class="kw">-></span>AddLink<span class="kw">();
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</span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">'here'</span><span class="kw">,</span>$link<span class="kw">);
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</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">);
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</span><span class="cmt">// Second page
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</span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
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</span>$pdf<span class="kw">-></span>SetLink<span class="kw">(</span>$link<span class="kw">);
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</span>$pdf<span class="kw">-></span>Image<span class="kw">(</span><span class="str">'logo.png'</span><span class="kw">,</span>10<span class="kw">,</span>12<span class="kw">,</span>30<span class="kw">,</span>0<span class="kw">,</span><span class="str">''</span><span class="kw">,</span><span class="str">'http://www.fpdf.org'</span><span class="kw">);
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</span>$pdf<span class="kw">-></span>SetLeftMargin<span class="kw">(</span>45<span class="kw">);
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</span>$pdf<span class="kw">-></span>SetFontSize<span class="kw">(</span>14<span class="kw">);
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</span>$pdf<span class="kw">-></span>WriteHTML<span class="kw">(</span>$html<span class="kw">);
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</span>$pdf<span class="kw">-></span>Output<span class="kw">();
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</span>?></code></pre>
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</div>
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<p class='demo'><a href='tuto6.php' target='_blank' class='demo'>[Demo]</a></p>
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The new method to print text is <a href='../doc/write.htm'>Write()</a>. It's very close to <a href='../doc/multicell.htm'>MultiCell()</a>; the differences are:
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<ul>
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<li>The end of line is at the right margin and the next line begins at the left one</li>
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<li>The current position moves at the end of the text</li>
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</ul>
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So it allows to write a chunk of text, alter the font style, then continue from the exact
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place we left it. On the other hand, you cannot justify it.
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<br>
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<br>
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The method is used on the first page to put a link pointing to the second one. The beginning of
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the sentence is written in regular style, then we switch to underline and finish it. The link
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is created with <a href='../doc/addlink.htm'>AddLink()</a>, which returns a link identifier. The identifier is
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passed as third parameter of Write(). Once the second page is created, we use <a href='../doc/setlink.htm'>SetLink()</a> to
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make the link point to the beginning of the current page.
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<br>
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<br>
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Then we put an image with an external link on it. An external link is just a URL. It's passed as
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last parameter of <a href='../doc/image.htm'>Image()</a>.
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<br>
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<br>
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Finally, the left margin is moved after the image with <a href='../doc/setleftmargin.htm'>SetLeftMargin()</a> and some text in
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HTML format is output. A very simple HTML parser is used for this, based on regular expressions.
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Recognized tags are <b>, <i>, <u>, <a> and <br>; the others are
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ignored. The parser also makes use of the Write() method. An external link is put the same way as
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an internal one (third parameter of Write()). Note that <a href='../doc/cell.htm'>Cell()</a> also allows to put links.
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</body>
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</html>
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