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@ 2022-05-04T13:30:03Z

<?php

$tests = [
    '152.15 x 12.34 x 11mm',
    '152.15x12.34x11 mm',
    '152.15mmx12.34mm x 11mm',
];

foreach ($tests as $test) {
    var_dump(
        sscanf($test, '%f%*[mx ]%f%*[mx ]%f')
    );
    echo "\n";
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
sscanf: documentation ( source)

preferences:dark modelive preview

27.73 ms | 402 KiB | 5 Q