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<p>The <strong>upper</strong> method converts all characters to uppercase. It is equivalent to PHP's strtoupper() for your specific character encoding.</p>
<p>The <strong>lower</strong> method converts all characters to lowercase. It is equivalent to PHP's strtolower() for your specific character encoding.</p>
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<p>The <strong>lower</strong> method converts all characters to lowercase. It is equivalent to PHP's strtolower() for your specific character encoding.</p>
<p>The <strong>sub</strong> method returns the portion of the string specified. It is equivalent to PHP's substr() for your specific character encoding.</p>
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<tableclass="method">
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<tbody>
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<tr>
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<thclass="legend">Static</th>
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<td>Yes</td>
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</tr>
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<tr>
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<th>Parameters</th>
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<td>
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<tableclass="parameters">
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<tr>
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<th>Param</th>
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<th>Default</th>
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<thclass="description">Description</th>
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</tr>
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<tr>
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<th><kbd>$str</kbd></th>
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<td><em>required</em></td>
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<td>The input string.</td>
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</tr>
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<tr>
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<th><kbd>$start</kbd></th>
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<td><em>required</em></td>
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<td>Position of first character. See <ahref="http://php.net/substr" target="_blank">php.net</a> for detailed usage.</td>
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</tr>
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<tr>
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<th><kbd>$length</kbd></th>
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<td><preclass="php"><code>null</code></pre></td>
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<td>Maximum number of characters. See <ahref="http://php.net/substr" target="_blank">php.net</a> for detailed usage.</td>
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