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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Examples</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="overload.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.overload.html">Object overloading Functions</a></div> <div class="up"><a href="book.overload.html">Object overloading</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Examples</h1> <div id="overload.examples.basic" class="section"> <p class="para"> Some simple examples on using the <a href="function.overload.html" class="function">overload()</a> function: <div class="example"> <p><b>Example #1 Overloading a PHP class</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">class </span><span style="color: #0000BB">OO </span><span style="color: #007700">{<br /> var </span><span style="color: #0000BB">$a </span><span style="color: #007700">= </span><span style="color: #0000BB">111</span><span style="color: #007700">;<br /> var </span><span style="color: #0000BB">$elem </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'b' </span><span style="color: #007700">=> </span><span style="color: #0000BB">9</span><span style="color: #007700">, </span><span style="color: #DD0000">'c' </span><span style="color: #007700">=> </span><span style="color: #0000BB">42</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">// Callback method for getting a property<br /> </span><span style="color: #007700">function </span><span style="color: #0000BB">__get</span><span style="color: #007700">(</span><span style="color: #0000BB">$prop_name</span><span style="color: #007700">, &</span><span style="color: #0000BB">$prop_value</span><span style="color: #007700">) <br /> {<br /> if (isset(</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">elem</span><span style="color: #007700">[</span><span style="color: #0000BB">$prop_name</span><span style="color: #007700">])) {<br /> </span><span style="color: #0000BB">$prop_value </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">elem</span><span style="color: #007700">[</span><span style="color: #0000BB">$prop_name</span><span style="color: #007700">];<br /> return </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /> } else {<br /> return </span><span style="color: #0000BB">false</span><span style="color: #007700">;<br /> }<br /> }<br /><br /> </span><span style="color: #FF8000">// Callback method for setting a property<br /> </span><span style="color: #007700">function </span><span style="color: #0000BB">__set</span><span style="color: #007700">(</span><span style="color: #0000BB">$prop_name</span><span style="color: #007700">, </span><span style="color: #0000BB">$prop_value</span><span style="color: #007700">) <br /> {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">elem</span><span style="color: #007700">[</span><span style="color: #0000BB">$prop_name</span><span style="color: #007700">] = </span><span style="color: #0000BB">$prop_value</span><span style="color: #007700">;<br /> return </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #FF8000">// Here we overload the OO object<br /></span><span style="color: #0000BB">overload</span><span style="color: #007700">(</span><span style="color: #DD0000">'OO'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$o </span><span style="color: #007700">= new </span><span style="color: #0000BB">OO</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">"\$o->a: $o->a\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// print: $o->a: 111<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"\$o->b: $o->b\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// print: $o->b: 9<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"\$o->c: $o->c\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// print: $o->c: 42<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"\$o->d: $o->d\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// print: $o->d:<br /><br />// add a new item to the $elem array in OO<br /></span><span style="color: #0000BB">$o</span><span style="color: #007700">-></span><span style="color: #0000BB">x </span><span style="color: #007700">= </span><span style="color: #0000BB">56</span><span style="color: #007700">; <br /><br /></span><span style="color: #FF8000">// instantiate stdclass (it is built-in in PHP 4)<br />// $val is not overloaded!<br /></span><span style="color: #0000BB">$val </span><span style="color: #007700">= new </span><span style="color: #0000BB">stdclass</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$val</span><span style="color: #007700">-></span><span style="color: #0000BB">prop </span><span style="color: #007700">= </span><span style="color: #0000BB">555</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Set "a" to be an array with the $val object in it<br />// But __set() will put this in the $elem array<br /></span><span style="color: #0000BB">$o</span><span style="color: #007700">-></span><span style="color: #0000BB">a </span><span style="color: #007700">= array(</span><span style="color: #0000BB">$val</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$o</span><span style="color: #007700">-></span><span style="color: #0000BB">a</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]-></span><span style="color: #0000BB">prop</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="overload.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.overload.html">Object overloading Functions</a></div> <div class="up"><a href="book.overload.html">Object overloading</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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