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<h2 class="title">Sanitization</h2>
<p class="para">
<div class="example" id="example-5088">
<p><strong>Example #1 Sanitizing and validating email addresses</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= </span><span style="color: #DD0000">'joe@example.org'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= </span><span style="color: #DD0000">'bogus - at - example dot org'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #DD0000">'(bogus@example.org)'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$sanitized_a </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_SANITIZE_EMAIL</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$sanitized_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 (a) sanitized email address is considered valid.\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$sanitized_b </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_SANITIZE_EMAIL</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$sanitized_b</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"This sanitized email address is considered valid."</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"This (b) sanitized email address is considered invalid.\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$sanitized_c </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_SANITIZE_EMAIL</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$sanitized_c</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 (c) sanitized email address is considered valid.\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #DD0000">"Before: </span><span style="color: #0000BB">$c</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #DD0000">"After: </span><span style="color: #0000BB">$sanitized_c</span><span style="color: #DD0000">\n"</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 (a) sanitized email address is considered valid.
This (b) sanitized email address is considered invalid.
This (c) sanitized email address is considered valid.
Before: (bogus@example.org)
After: bogus@example.org
</pre></div>
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</div>
</p>
<p class="para">
<div class="example" id="example-5089">
<p><strong>Example #2 Configuring a default filter</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
filter.default = full_special_chars<br />filter.default_flags = 0</span>
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