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@ 2017-07-07T08:11:42Z

<?php
$test = '1234';
try{
    $testcopy = $test;
    $testcopy = str_replace( '1' );
    $test = $testcopy;
}catch(Exception $e){
    
}
var_dump ($test);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

32.51 ms | 402 KiB | 5 Q