<?php

function test_original($count, $propertyName) {
    $time_start = microtime(true);
    for ($a=0; $a < $count; $a++) {
        $snakeCasedName = '';

         $len = strlen($propertyName);
         for ($i = 0; $i < $len; ++$i) {
             if (ctype_upper($propertyName[$i]) && $i !== 0) {
                 $snakeCasedName .= '_'.strtolower($propertyName[$i]);
             } else {
                 $snakeCasedName .= strtolower($propertyName[$i]);
             }
        }
    }
    return number_format(microtime(true) - $time_start, 3);
}


function test_energetick($count, $propertyName) {
    $time_start = microtime(true);
    for ($a=0; $a < $count; $a++) {
        $len = strlen($propertyName) - 1;
        $lowerCasedName = strtolower($propertyName);

        // First character taken as is
        $snakeCasedName = isset($lowerCasedName[0]) ? $lowerCasedName[0] : '';

        for ($i = 1; $i < $len; ++$i) {
            // If uppercase
            if ($lowerCasedName[0] !== $propertyName[$i]) {
               $snakeCasedName .= '_';
            }

            $snakeCasedName .= $lowerCasedName[$i];
        }
    }
    return number_format(microtime(true) - $time_start, 3);
}


function test_dunglas($count, $propertyName) {
    $time_start = microtime(true);
    for ($a=0; $a < $count; $a++) {
        $snakeCasedName = '';

        $len = strlen($propertyName);
        for ($i = 0; $i < $len; ++$i) {
            $lcPropertyName = strtolower($propertyName[$i]);
            if (0 !== $i && $lcPropertyName !== $propertyName[$i]) {
                $snakeCasedName .= '_'.$lcPropertyName;
            } else {
                $snakeCasedName .= $lcPropertyName;
            }
        }
    }
    return number_format(microtime(true) - $time_start, 3);
}

foreach (['test_original', 'test_energetick', 'test_dunglas'] as $function) {
    $result = $function(100000, 'aLongNameIsVeryLong');
    echo $function." : ".$result." sec.\n";
}