PHP 的 变量类型
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<!--DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta http-equiv="Content-Style-Type" content="text/css"> <title></title> <meta name="Generator" content="Cocoa HTML Writer"> <meta name="CocoaVersion" content="1138.51"> <style type="text/css"> p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; color: #336699; background-color: #ffffff} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; color: #669933; background-color: #ffffff} p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; color: #669933; background-color: #ffffff; min-height: 17.0px} p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Courier; color: #cc3333; background-color: #ffffff} span.s1 {color: #336699} span.s2 {color: #669933} span.s3 {color: #cc3333} </style></head><body><p class="p1"><?php</p><p class="p2">class <span class="s1">Point </span>{ }</p><p class="p1"><span class="s2">class </span>Dimension <span class="s2">{ }</span></p><p class="p1"><span class="s2">class </span>Rectangle <span class="s2">{ }</span></p><p class="p3"><br></p><p class="p1">$items <span class="s2">= array(</span>true<span class="s2">, </span>false<span class="s2">, </span>null<span class="s2">, </span>23<span class="s2">, </span>0<span class="s2">, -</span>26<span class="s2">, </span>4.21<span class="s2">, </span>0.0<span class="s2">, -</span>3.76<span class="s2">,</span></p><p class="p2"> <span class="s3">'hello'</span>, <span class="s3">''</span>, array(<span class="s1">1</span>, <span class="s1">2</span>, <span class="s1">3</span>), array(<span class="s3">''</span>, <span class="s3">''</span>, <span class="s3">''</span>), array(),</p><p class="p2"> new <span class="s1">stdClass</span>(), new <span class="s1">Point</span>(), new <span class="s1">Dimension</span>(), new <span class="s1">Rectangle</span>());</p><p class="p3"><br></p><p class="p4"><span class="s2">echo </span>'<table cellpadding="4" border="1"></p><p class="p4"> <tr></p><p class="p4"> <th>syntax</th></p><p class="p4"> <th>value</th></p><p class="p4"> <th>type</th></p><p class="p4"> <th>empty</th></p><p class="p4"> <th>boolean</th></p><p class="p4"> </tr>' <span class="s2">. </span>"\n"<span class="s2">;</span></p><p class="p3"><br></p><p class="p2">foreach(<span class="s1">$items </span>AS <span class="s1">$item</span>)</p><p class="p2">{</p><p class="p1"><span class="s2"> </span>$booleanValue <span class="s2">= (boolean)</span>$item<span class="s2">;</span></p><p class="p2"> <span class="s1">$empty </span>= (empty(<span class="s1">$item</span>) ? <span class="s3">'EMPTY' </span>: <span class="s3">' '</span>);</p><p class="p1"><span class="s2"> </span>$type <span class="s2">= </span>gettype<span class="s2">(</span>$item<span class="s2">);</span></p><p class="p4"><span class="s2"> </span><span class="s1">$syntax </span><span class="s2">= </span>'if((boolean)'<span class="s2">;</span></p><p class="p3"><br></p><p class="p1"><span class="s2"> </span>$val<span class="s2">;</span></p><p class="p3"><br></p><p class="p1"><span class="s2"> if(</span>$type <span class="s2">== </span>boolean<span class="s2">)</span></p><p class="p2"> {</p><p class="p1"><span class="s2"> </span>$val <span class="s2">= (</span>$booleanValue <span class="s2">? </span><span class="s3">'true' </span><span class="s2">: </span><span class="s3">'false'</span><span class="s2">);</span></p><p class="p1"><span class="s2"> </span>$syntax <span class="s2">.= (</span>$val <span class="s2">. </span><span class="s3">')'</span><span class="s2">);</span></p><p class="p2"> }</p><p class="p2"> else if(<span class="s1">$type </span>== <span class="s3">'NULL'</span>)</p><p class="p2"> {</p><p class="p2"> <span class="s1">$val </span>= <span class="s3">'null'</span>;</p><p class="p2"> <span class="s1">$syntax </span>.= <span class="s3">'null)'</span>;</p><p class="p2"> }</p><p class="p1"><span class="s2"> else if(</span>$type <span class="s2">== </span>double <span class="s2">&& !</span>$booleanValue<span class="s2">)</span></p><p class="p2"> {</p><p class="p2"> <span class="s1">$val </span>= <span class="s3">'0.0'</span>;</p><p class="p2"> <span class="s1">$syntax </span>.= <span class="s3">'0.0)'</span>;</p><p class="p2"> }</p><p class="p2"> else if(<span class="s1">$type </span>== <span class="s1">string</span>)</p><p class="p2"> {</p><p class="p2"> <span class="s1">$val </span>= <span class="s3">'\'' </span>. <span class="s1">$item </span>. <span class="s3">'\''</span>;</p><p class="p1"><span class="s2"> </span>$syntax <span class="s2">.= (</span>$val <span class="s2">. </span><span class="s3">')'</span><span class="s2">);</span></p><p class="p2"> }</p><p class="p2"> else if(<span class="s1">$type </span>== <span class="s3">'array'</span>)</p><p class="p2"> {</p><p class="p1"><span class="s2"> </span>$val <span class="s2">= </span>$item<span class="s2">;</span></p><p class="p4"><span class="s2"> </span><span class="s1">$syntax </span><span class="s2">.= </span>'$array)'<span class="s2">;</span></p><p class="p2"> }</p><p class="p2"> else if(<span class="s1">$type </span>== <span class="s3">'object'</span>)</p><p class="p2"> {</p><p class="p1"><span class="s2"> </span>$val <span class="s2">= </span>get_class<span class="s2">(</span>$item<span class="s2">);</span></p><p class="p1"><span class="s2"> </span>$syntax <span class="s2">.= (</span><span class="s3">'$' </span><span class="s2">. </span>strtolower<span class="s2">(</span>$val<span class="s2">) . </span><span class="s3">')'</span><span class="s2">);</span></p><p class="p2"> }</p><p class="p2"> else</p><p class="p2"> {</p><p class="p1"><span class="s2"> </span>$val <span class="s2">= </span>$item<span class="s2">;</span></p><p class="p1"><span class="s2"> </span>$syntax <span class="s2">.= (</span>$val <span class="s2">. </span><span class="s3">')'</span><span class="s2">);</span></p><p class="p2"> }</p><p class="p3"><br></p><p class="p4"><span class="s2"> echo </span>' <tr style="color: ' <span class="s2">. (</span><span class="s1">$booleanValue </span><span class="s2">? </span>'#006600' <span class="s2">: </span>'#880000'<span class="s2">) . </span>';"></p><p class="p4"> <td><code>' <span class="s2">. </span><span class="s1">$syntax </span><span class="s2">. </span>'</code></td></p><p class="p4"> <td>' <span class="s2">. </span><span class="s1">$val </span><span class="s2">. </span>'</td></p><p class="p4"> <td>' <span class="s2">. </span><span class="s1">$type </span><span class="s2">. </span>'</td></p><p class="p4"> <td>' <span class="s2">. </span><span class="s1">$empty </span><span class="s2">. </span>'</td></p><p class="p4"> <td>' <span class="s2">. (</span><span class="s1">$booleanValue </span><span class="s2">? </span>'TRUE' <span class="s2">: </span>'FALSE'<span class="s2">) . </span>'</td></p><p class="p4"> </tr>' <span class="s2">. </span>"\n"<span class="s2">;</span></p><p class="p2">}</p><p class="p3"><br></p><p class="p4"><span class="s2">echo </span>'</table>' <span class="s2">. </span>"\n"<span class="s2">;</span></p><p class="p3"><br></p><p class="p1">?></p></body></html>--><?phpclass Point { }class Dimension { }class Rectangle { }$items = array(true, false, null, 23, 0, -26, 4.21, 0.0, -3.76, 'hello', '', array(1, 2, 3), array('', '', ''), array(), new stdClass(), new Point(), new Dimension(), new Rectangle());echo '<table cellpadding="4" border="1"> <tr> <th>syntax</th> <th>value</th> <th>type</th> <th>empty</th> <th>boolean</th> </tr>' . "\n";foreach($items AS $item){ $booleanValue = (boolean)$item; $empty = (empty($item) ? 'EMPTY' : ' '); $type = gettype($item); $syntax = 'if((boolean)'; $val; if($type == boolean) { $val = ($booleanValue ? 'true' : 'false'); $syntax .= ($val . ')'); } else if($type == 'NULL') { $val = 'null'; $syntax .= 'null)'; } else if($type == double && !$booleanValue) { $val = '0.0'; $syntax .= '0.0)'; } else if($type == string) { $val = '\'' . $item . '\''; $syntax .= ($val . ')'); } else if($type == 'array') { $val = $item; $syntax .= '$array)'; } else if($type == 'object') { $val = get_class($item); $syntax .= ('$' . strtolower($val) . ')'); } else { $val = $item; $syntax .= ($val . ')'); } echo ' <tr style="color: ' . ($booleanValue ? '#006600' : '#880000') . ';"> <td><code>' . $syntax . '</code></td> <td>' . $val . '</td> <td>' . $type . '</td> <td>' . $empty . '</td> <td>' . ($booleanValue ? 'TRUE' : 'FALSE') . '</td> </tr>' . "\n";}echo '</table>' . "\n";?> 0 0
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