String Service

StringService.php

<?php

namespace App\Services;

class StringService
{
    /**
     * Find ALL strings that are between two strings. Optionally include delimiters.
     */
    function strBetweenAll(string $string, string $start, string $end, bool $includeDelimiters = false, int &$offset = 0): ?array
    {
        $strings = [];
        $length = strlen($string);
    
        while ($offset < $length)
        {
            $found = $this->strBetween($string, $start, $end, $includeDelimiters, $offset);
            if ($found === null) break;
    
            $strings[] = $found;
            $offset += strlen($includeDelimiters ? $found : $start . $found . $end); // move offset to the end of the newfound string
        }
    
        return $strings;
    }

    /**
     * Find a string between two strings. Optionally include delimiters.
     */
    function strBetween(string $string, string $start, string $end, bool $includeDelimiters = false, int &$offset = 0): ?string
    {
        if ($string === '' || $start === '' || $end === '') return null;
    
        $startLength = strlen($start);
        $endLength = strlen($end);
    
        $startPos = strpos($string, $start, $offset);
        if ($startPos === false) return null;
    
        $endPos = strpos($string, $end, $startPos + $startLength);
        if ($endPos === false) return null;
    
        $length = $endPos - $startPos + ($includeDelimiters ? $endLength : -$startLength);
        if (!$length) return '';
    
        $offset = $startPos + ($includeDelimiters ? 0 : $startLength);
    
        $result = substr($string, $offset, $length);
    
        return ($result !== false ? $result : null);
    }

}