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@ 2018-12-15T23:16:12Z

<?php
$a = [];
$x = 63;
for ($x = 0; $x < 10000; $x++) {
    $a[] = substr($x, 0, 1);
    $a[] = substr($x, 1, 1);
    
//    $x_arr = str_split($x);
   $a[] = array_shift($x);
   $a[] = array_shift($x);
}

echo count($a);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
array_shift: documentation ( source)

preferences:dark modelive preview

40.99 ms | 402 KiB | 5 Q