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@ 2016-02-02T09:08:02Z

<?php
if ( class_exists( 'closure' ) ) {
    $example = function () {
        echo 'SAFE';
    };
    $example();
} else {
    echo 'NOPE';
}

Output
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class_exists: documentation ( source)

preferences:dark modelive preview

74.29 ms | 404 KiB | 5 Q