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@ 2020-03-03T11:43:06Z

<?php

$string = 'Hello John, how are you John. John are you happy with your life John?';

$numberOfInstances = 2;

echo implode('dude', explode('John', $string, $numberOfInstances + 1));

Output
Performance
VLD
References
Branches

implode: documentation ( source)
explode: documentation ( source)

preferences:dark modelive previewkey bindings

31.94 ms | 405 KiB | 5 Q