Online PHP editor | output for qUX0l

@ 2014-08-01T21:49:40Z

<?php

function do_split($name) {
    return preg_split('/([A-Z]{2,}|([A-Z][^A-Z]*))/', $name, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
}

function convert_case($name) {
    return implode(
        '_',
        array_map(
            'strtolower',
            do_split($name)
        )
    );
}

function convert_case2($name) {
    $output = '';
    for ($i=0; $i<strlen($name); $i++) {
        $char = $name[$i];
        echo "{$char} " . json_encode(ctype_upper($char)) . "\n";
    }
    return strtolower($output);
}

convert_case2('FooBARbar0123');

$samples = array(
    'FooBar',
    'FooBAR',
    'FOObar',
    'foo_bar',
    'FOO_bar',
    'foo_BAR',
    'foo_Bar',
    'Foo_bar',
);


/*
print_r(array_map(function ($name) {
    return array(
        'name' => $name,
        'split' => do_split($name),
        'converted' => convert_case($name),
    );
}, $samples));
*/

Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 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 - 8.3.6: F true o false o false B true A true R true b false a false r false 0 false 1 false 2 false 3 false
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Call to undefined function json_encode() in /in/qUX0l on line 21
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: json_encode() in /in/qUX0l on line 21
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: json_encode() in /in/qUX0l on line 21
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: json_encode() in /in/qUX0l on line 21

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