آموزش کامل preg_replace_callback در PHP مثال‌های کاربردی از Regex

preg_replace_callback(
	string|array $pattern,
	callable $callback,
	string|array $subject,
	int $limit = -1,
	int &$count = null,
	int $flags = 0
): string|array|null

/**
 * Converts numbers to their word equivalents
 * 
 * @param array $matches Array of matches from preg_replace_callback
 * @return string The replaced text
 */
function numberToWords ( array $matches ): string {
	
	$numberMap = [
		0 => 'صفر', 1 => 'یک', 2 => 'دو', 
		3 => 'سه', 4 => 'چهار', 5 => 'پنج'
	];
	return $numberMap[$matches[1]] ?? $matches[0];
}

$text = "من 3 سیب و 5 پرتقال دارم";
$result = preg_replace_callback (
	'/\b(\d)\b/', 
	'numberToWords', 
	$text
);

// نتیجه: "من سه سیب و پنج پرتقال دارم"

/**
 * Increments all numbers found in text
 * 
 * @param array $matches Array of matches
 * @return string Incremented number
 */
function incrementNumbers ( array $matches ): string {
	
	return $matches[1]   1;
}

$text = "نسخه 1.2.3 منتشر شد";
$result = preg_replace_callback (
	'/(\d )/',
	'incrementNumbers',
	$text
);

// نتیجه: "نسخه 2.3.4 منتشر شد"

/**
 * Obfuscates email addresses for privacy
 * 
 * @param array $matches Matched email pattern
 * @return string Obfuscated email
 */
function obfuscateEmail ( array $matches ): string {
	
	$parts		= explode ( '@', $matches[0] );
	$username	= substr ( $parts[0], 0, 2 ) . '...';
	return $username . '@' . $parts[1];
}

$text = "Contact us at info@example.com or support@domain.com";
$result = preg_replace_callback (
	'/[a-zA-Z0-9._% -] @[a-zA-Z0-9.-] \.[a-zA-Z]{2,}/',
	'obfuscateEmail',
	$text
);

// Result: "Contact us at in...@example.com or su...@domain.com"

$text	= "Temperature is 25C and 30C";
$result	= preg_replace_callback (
	'/(\d )C/',
	function ( $matches ) {
		return ( $matches[1] * 9/5 )   32 . 'F';
	},
	$text
);

// Result: "Temperature is 77F and 86F"

$patterns = [
	'/\b\d{4}\b/',  // 4-digit numbers
	'/\b[A-Z]{3}\b/' // 3-letter uppercase codes
];

$text	= "Order 1234 with code ABC and 5678 with XYZ";
$result	= preg_replace_callback (
	$patterns,
	function ( $matches ) {
		return str_repeat ( '*', strlen($matches[0] ) );
	},
	$text
);

// Result: "Order  with code * and  with *"

$pattern = '/
	\b          # Word boundary
	(\d{2,4})   # 2 to 4 digits (year)
	\/          # Separator
	(\d{1,2})   # 1-2 digits (month)
	\/          # Separator
	(\d{1,2})   # 1-2 digits (day)
	\b          # Word boundary
/x';