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@ 2019-12-18T21:35:18Z

<?php
$match = 'today';
$n = 2;
for ($pos = strlen($match) - $n; $pos >= 0; --$pos) {
    $nGrams[] = substr($match, $pos, $n);
}
var_export($nGrams);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

117.94 ms | 405 KiB | 5 Q