Online PHP editor | output for mWUmQ

@ 2014-08-02T22:38:44Z

<?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($in) {
	$len = strlen($in);
	if ($len < 2) {
		return strtolower($in);
	}
	$pos = 0;
	$out = '';
    $peek = function() use ($in, $pos, $len) {
        if ($pos+1 >= $len) {
            return null;
        }
        return $in[$pos+1];
    };
	$next = function() use ($peek, &$pos) {
        $c = $peek();
        if ($c === null) {
            return null;
        }
        $pos++;
        return $c;
	};
    $upper = function ($c) {
        return 'A' <= $c && $c <= 'Z';
    };
    $lower = function ($c) {
        return 'a' <= $c && $c <= 'z';
    };
    $alpha = function ($c) use ($upper, $lower) {
        return $upper($c) || $lower($c);
    };
    $num = function ($c) {
        return '0' <= $c && $c <= '9';
    };
    $alpha_num = function ($c) use ($alpha, $num) {
        return $alpha($c) || $num($c);
    };

	$start_state = function () use (&$out, $next, $peek) {
        for ($c = $next(); $c !== null; $c = $next()) {
            $out .= $c;
        }
        return null;
	};

	$state = $start_state;
	while ($state !== null) {
		$state = $state();
	}
    return strtolower($out);
}

convert_case2('FooBARbar0123');

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



print_r(array_map(function ($name) {
    return array(
        'name' => $name,
        'converted' => convert_case2($name),
        //        'converted' => convert_case($name),
    );
}, $samples));

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 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 - 8.1.6, 8.1.10, 8.1.12, 8.1.14, 8.1.21 - 8.1.22, 8.1.24, 8.1.28, 8.2.0, 8.2.3, 8.2.5, 8.2.11, 8.2.16, 8.2.18, 8.3.3 - 8.3.6: Process exited with code 137.
Output for 8.2.1 - 8.2.2, 8.2.6 - 8.2.10, 8.2.12 - 8.2.15, 8.2.17, 8.3.0 - 8.3.2: Fatal error: Out of memory (allocated 18874368 bytes) (tried to allocate 14680072 bytes) in /in/mWUmQ on line 56 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.2.4: Fatal error: Out of memory (allocated 18874368 bytes) (tried to allocate 14680072 bytes) in /in/mWUmQ on line 56 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 137.
Output for 8.1.7 - 8.1.9, 8.1.11, 8.1.13, 8.1.15 - 8.1.20, 8.1.23, 8.1.25 - 8.1.27: Fatal error: Out of memory (allocated 18874368) (tried to allocate 14680072 bytes) in /in/mWUmQ on line 56 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/mWUmQ on line 24
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/mWUmQ on line 24
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/mWUmQ on line 24
Process exited with code 255.

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