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@ 2015-08-25T18:05:12Z

<?php

$cep_1 = '04157-000';

$cep_2 = '04157000';

if( !preg_match('/-/',$cep_2) ){
    
    echo substr_replace(cep_2, '-', 5, 0);
}else{
    echo 'com';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
substr_replace: documentation ( source)

preferences:dark modelive preview

66.04 ms | 402 KiB | 5 Q