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@ 2017-12-04T11:14:59Z

<?php

for($i=1;$i<1000;$i++){
    $string = [];
    $string[]='lorem_';
    $string[]= $i;
    $string[]='_ipsum';
    $string = join('',$string);
    var_dump($string);
    // unset($string);
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
join: documentation ( source)

preferences:dark modelive preview

16.64 ms | 402 KiB | 5 Q