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is_serialized( string $data, bool $strict = true )

Check value to find if it was serialized.

Description

If $data is not an string, then returned value will always be false. Serialized data is always a string.

Parameters

$data

(string) (Required) Value to check to see if was serialized.

$strict

(bool) (Optional) Whether to be strict about the end of the string.

Default value: true

Return

(bool) False if not serialized and true if it was.

More Information

Usage:
is_serialized( $data );
Notes:

Data might need to be serialized to allow it to be successfully stored and retrieved from a database in a form that PHP can understand.

Source

File: wp-includes/functions.php 

function is_serialized( $data, $strict = true ) {
	// If it isn't a string, it isn't serialized.
	if ( ! is_string( $data ) ) {
		return false;
	}
	$data = trim( $data );
	if ( 'N;' === $data ) {
		return true;
	}
	if ( strlen( $data ) < 4 ) {
		return false;
	}
	if ( ':' !== $data[1] ) {
		return false;
	}
	if ( $strict ) {
		$lastc = substr( $data, -1 );
		if ( ';' !== $lastc && '}' !== $lastc ) {
			return false;
		}
	} else {
		$semicolon = strpos( $data, ';' );
		$brace     = strpos( $data, '}' );
		// Either ; or } must exist.
		if ( false === $semicolon && false === $brace ) {
			return false;
		}
		// But neither must be in the first X characters.
		if ( false !== $semicolon && $semicolon < 3 ) {
			return false;
		}
		if ( false !== $brace && $brace < 4 ) {
			return false;
		}
	}
	$token = $data[0];
	switch ( $token ) {
		case 's':
			if ( $strict ) {
				if ( '"' !== substr( $data, -2, 1 ) ) {
					return false;
				}
			} elseif ( false === strpos( $data, '"' ) ) {
				return false;
			}
			// Or else fall through.
		case 'a':
		case 'O':
			return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
		case 'b':
		case 'i':
		case 'd':
			$end = $strict ? '$' : '';
			return (bool) preg_match( "/^{$token}:[0-9.E+-]+;$end/", $data );
	}
	return false;
}

Used By

Used By Description
wp-includes/formatting.php: wp_targeted_link_rel()

Adds rel noreferrer and noopener to all HTML A elements that have a target.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::import_theme_starter_content()

Import theme starter content into the customized state.
wp-admin/includes/template.php: _list_meta_row()

Outputs a single row of public meta data in the Custom Fields meta box.
wp-includes/functions.php: maybe_serialize()

Serialize data, if needed.
wp-includes/functions.php: maybe_unserialize()

Unserialize data only if it was serialized.

Changelog

Version Description
2.0.5 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/is_serialized