Online PHP editor | rfc for LYPJh

@ 2014-06-09T15:52:36Z

<?php
/**
strrev function implementation taken from ext/standard/string.c PHP-5-5 branch
http://lxr.php.net/xref/PHP_5_5/ext/standard/string.c#3165

// {{{ proto string strrev(string str)
//   Reverse a string 
PHP_FUNCTION(strrev)
{
    char *str;
    char *e, *n, *p;
    int  str_len;

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
        return;
    }

    n = emalloc(str_len+1);
    p = n;

    e = str + str_len;

    while (--e>=str) {
        *p++ = *e;
    }

    *p = '\0';

    RETVAL_STRINGL(n, str_len, 0);
}
// }}}
*/

// PHP Implementation
function userland_strrev($string) {
    if (!is_string($string)) {
        return false;
    }

    $new_string = "";
    $len = strlen($string);

    while (--$len) {
        $new_string .= $string[$len];
    }

    return $new_string;
}

$string = "Hello PHP!";
var_dump(strrev($string), userland_strrev($string));
/*
for ($i = 0; $i < $n; $i++) {
    $t = microtime(true);

    $php[] = microtime(true) - $t;
}
*/

Output for git.master, git.master_jit, rfc.property-hooks: string(10) "!PHP olleH" string(9) "!PHP olle"

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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
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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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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