Online PHP editor | rfc for XCanS

@ 2023-08-15T19:21:20Z

<?php

/**
 * Напишите реализацию для ф-ии strstr:
 * function strstr(string $haystack, string $needle)
 * нельзя использовать встроенные ф-ии php: substr, strtok, ...
 * (*) это более удачная реализация, работает за О(n)
 */

/**
 * Find substring starting in string, starting from some symbol(s)
 * @param string $haystack
 * @param string $needle
 * @return string
 */
function my_strstr2(string $haystack, string $needle): string
{
    $isFound = false;
    $lenHaystack = strlen($haystack);
    $lenNeedle = strlen($needle);
    
    for($i = 0, $j = 0, $cnt = 0; $i < $lenHaystack, $j < $lenNeedle; $i++) {
        if($haystack[$i + $j] == $needle[$j]) {
            $j++;
        } else {
            $j = 0;
        }   
        
        if($j >= strlen($lenNeedle)) {
            $isFound = true;
            break;
        }
    }    
    
    return ($isFound ? substr($haystack, $i) : '');
}

var_dump(my_strstr2('asdfghend', 'fg')); // 'fghend';

Output for git.master_jit, git.master, rfc.property-hooks: string(6) "fghend"

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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