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@ 2015-11-21T08:50:42Z

<?php

    $string = '763:74
74:274
177:474';

$result = [];
preg_replace_callback('/(\d+):(\d+)/m',function($m,&$result){
    $result[$m[1]] = $m[2];
},$string);

print_r($result);
echo $result[74]."\n";
echo $result[763]."\n";

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

47.89 ms | 402 KiB | 5 Q