Online PHP editor | rfc for n9NrJ

@ 2014-08-02T00:51:13Z

<?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) {
    $length = strlen($name);
    if ($length < 2) {
        return strtolower($name);
    }
    $output = '';
	// init stream
    $prev_val = '_';
    $prev_upr = false;
	$char_val = $name[0];
	$char_upr = ctype_upper($char_val);
    for ($i = 0; $i < $length; $i++) {
        // peek
		$next_val = $i+1 < $length ? $name[$i+1] : '_';
		$next_upr = ctype_upper($next_val);
        if ($prev_val == '_') {
            if ($char_val == '_') {
                continue;
            }
            $output .= $char_val;
        } else if ($char_upr !== $prev_upr) {
            $output .= '_'.$char_val;
        } else if ($char_upr && !$next_upr) { // && $prev_upr
            if ($prev_upr) {
                $output .= '_'.$char_val;
                $char_upr = false;
            } else {
	            $output .= $char_val;
            }
        } else {
            $output .= $char_val;
        }
		// roll over
		$prev_val = $char_val;
        $prev_upr = $char_upr;
        $char_val = $next_val;
        $char_upr = $next_upr;
    }
    return strtolower($output);
}

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 git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [name] => FooBar [converted] => f_oo_b_ar ) [1] => Array ( [name] => FooBAR [converted] => f_oo_ba_r ) [2] => Array ( [name] => FOOBar [converted] => foo_bar ) [3] => Array ( [name] => foo_bar [converted] => foo_bar ) [4] => Array ( [name] => FOO_bar [converted] => fo_o_bar ) [5] => Array ( [name] => FOO_Bar [converted] => fo_o_b_ar ) [6] => Array ( [name] => foo_BAR [converted] => foo_ba_r ) [7] => Array ( [name] => foo_Bar [converted] => foo_b_ar ) [8] => Array ( [name] => Foo_bar [converted] => f_oo_bar ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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