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@ 2020-12-20T21:34:19Z

<?php

$text = <<<TEXT
== My Subheading == 
=== My sub Subheading ===
==== another heading ====
TEXT;

class ContentParser
{
    private $patterns = [];
    private $replacements = [];

    public function __construct() {
        $this->patterns = [
            // Headings
            "/^==== (.+?) ====\h*$/m",
            "/^=== (.+?) ===\h*$/m",
            "/^== (.+?) ==\h*$/m",
        ];
        $this->replacements = [
            // Headings
            "<h3>$1</h3>",
            "<h2>$1</h2>",
            "<h1>$1</h1>",
    
        ];
    }
    public function parse($input) {
        if (!empty($input)) {
            $output = preg_replace($this->patterns, $this->replacements, $input);
        } else {
            $output = false;  // I don't recommend returning a boolean when otherwise returning strings
        }
        return $output;
    }
}

$object = new ContentParser();
var_export($object->parse($text));

Output for rfc.property-hooks, git.master, git.master_jit: '<h1>My Subheading</h1> <h2>My sub Subheading</h2> <h3>another heading</h3>'

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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