<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Validation</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="filter.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="filter.examples.sanitization.html">Sanitization</a></div> <div class="up"><a href="filter.examples.html">Examples</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="filter.examples.validation" class="section"> <h2 class="title">Validation</h2> <p class="para"> <div class="example" id="example-5085"> <p><strong>Example #1 Validating email addresses with <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$email_a </span><span style="color: #007700">= </span><span style="color: #DD0000">'joe@example.com'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$email_b </span><span style="color: #007700">= </span><span style="color: #DD0000">'bogus'</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$email_a</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"This (</span><span style="color: #0000BB">$email_a</span><span style="color: #DD0000">) email address is considered valid."</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$email_b</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"This (</span><span style="color: #0000BB">$email_b</span><span style="color: #DD0000">) email address is considered valid."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> This (joe@example.com) email address is considered valid. </pre></div> </div> </div> </p> <p class="para"> <div class="example" id="example-5086"> <p><strong>Example #2 Validating IP addresses with <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$ip_a </span><span style="color: #007700">= </span><span style="color: #DD0000">'127.0.0.1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$ip_b </span><span style="color: #007700">= </span><span style="color: #DD0000">'42.42'</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip_a</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_IP</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"This (ip_a) IP address is considered valid."</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip_b</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_IP</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"This (ip_b) IP address is considered valid."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> This (ip_a) IP address is considered valid. </pre></div> </div> </div> </p> <p class="para"> <div class="example" id="example-5087"> <p><strong>Example #3 Passing options to <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$int_a </span><span style="color: #007700">= </span><span style="color: #DD0000">'1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$int_b </span><span style="color: #007700">= </span><span style="color: #DD0000">'-1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$int_c </span><span style="color: #007700">= </span><span style="color: #DD0000">'4'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$options </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'options' </span><span style="color: #007700">=> array(<br /> </span><span style="color: #DD0000">'min_range' </span><span style="color: #007700">=> </span><span style="color: #0000BB">0</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'max_range' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">,<br /> )<br />);<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_a</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">) !== </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"This (int_a) integer is considered valid (between 0 and 3).\n"</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_b</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">) !== </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"This (int_b) integer is considered valid (between 0 and 3).\n"</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_c</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">) !== </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"This (int_c) integer is considered valid (between 0 and 3).\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$options</span><span style="color: #007700">[</span><span style="color: #DD0000">'options'</span><span style="color: #007700">][</span><span style="color: #DD0000">'default'</span><span style="color: #007700">] = </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />if ((</span><span style="color: #0000BB">$int_c </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_c</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">)) !== </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"This (int_c) integer is considered valid (between 0 and 3) and is </span><span style="color: #0000BB">$int_c</span><span style="color: #DD0000">."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> This (int_a) integer is considered valid (between 0 and 3). This (int_c) integer is considered valid (between 0 and 3) and is 1. </pre></div> </div> </div> </p> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="filter.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="filter.examples.sanitization.html">Sanitization</a></div> <div class="up"><a href="filter.examples.html">Examples</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>