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@ 2017-05-08T08:37:10Z

<?php
$foo = substr("foo",3);
if(strlen($foo) == 0){
    echo "Run on both PHP 5 and PHP 7\n";
    echo gettype($foo); //boolean on PHP 5 and string on PHP 7
}

Output
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References
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substr: documentation ( source)

preferences:dark modelive preview

35.71 ms | 404 KiB | 5 Q