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<documentation title="Including Code">
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<standard>
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<![CDATA[
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Anywhere you are unconditionally including a class file, use <em>require_once</em>. Anywhere you are conditionally including a class file (for example, factory methods), use <em>include_once</em>. Either of these will ensure that class files are included only once. They share the same file list, so you don't need to worry about mixing them - a file included with <em>require_once</em> will not be included again by <em>include_once</em>.
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]]>
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</standard>
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<standard>
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<![CDATA[
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Note that <em>include_once</em> and <em>require_once</em> are statements, not functions. Parentheses should not surround the subject filename.
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]]>
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</standard>
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<code_comparison>
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<code title="Valid: used as statement">
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<![CDATA[
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require_once 'PHP/CodeSniffer.php';
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]]>
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</code>
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<code title="Invalid: used as function">
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<![CDATA[
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require_once<em>(</em>'PHP/CodeSniffer.php'<em>)</em>;
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]]>
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</code>
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</code_comparison>
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</documentation>
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<documentation title="Line Length">
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<standard>
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<![CDATA[
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It is recommended to keep lines at approximately 85 characters long for better code readability.
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]]>
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</standard>
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</documentation>
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