Online PHP editor | output for qTioM

@ 2017-01-25T09:42:34Z

<?php

function f($propertyName): string
{
    $lcPropertyName = lcfirst($propertyName);
    $snakeCasedName = '';
    
    $len = strlen($lcPropertyName);
    
    for ($i = 0; $i < $len; ++$i) {
        if (ctype_upper($propertyName[$i])) {
            $snakeCasedName .= '_'.strtolower($propertyName[$i]);
        } else {
            $snakeCasedName .= strtolower($propertyName[$i]);
        }
    }
    
    return $snakeCasedName;
}

echo f('ThisIsATest').PHP_EOL;
echo f('thisIsATest');

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: _this_is_a_test this_is_a_test
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 _this_is_a_test this_is_a_test

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