wp_remove_surrounding_empty_script_tags( string $contents ): string

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness. Use wp_print_inline_script_tag() instead.

Removes leading and trailing _empty_ script tags.


This is a helper meant to be used for literal script tag construction within wp_get_inline_script_tag() or wp_print_inline_script_tag().
It removes the literal values of "" and "" from around an inline script after trimming whitespace. Typically this is used in conjunction with output buffering, where ob_get_clean() is passed as the $contents argument.


// Strips exact literal empty SCRIPT tags.
$js = '<script>sayHello();</script>;
'sayHello();' === wp_remove_surrounding_empty_script_tags( $js );

// Otherwise if anything is different it warns in the JS console.
$js = '<script type="text/javascript">console.log( "hi" );</script>';
'console.error( ... )' === wp_remove_surrounding_empty_script_tags( $js );

See also


Script body with manually created SCRIPT tag literals.


string Script body without surrounding script tag literals, or original contents if both exact literals aren’t present.


function wp_remove_surrounding_empty_script_tags( $contents ) {
	$contents = trim( $contents );
	$opener   = '<SCRIPT>';
	$closer   = '</SCRIPT>';

	if (
		strlen( $contents ) > strlen( $opener ) + strlen( $closer ) &&
		strtoupper( substr( $contents, 0, strlen( $opener ) ) ) === $opener &&
		strtoupper( substr( $contents, -strlen( $closer ) ) ) === $closer
	) {
		return substr( $contents, strlen( $opener ), -strlen( $closer ) );
	} else {
		$error_message = __( 'Expected string to start with script tag (without attributes) and end with script tag, with optional whitespace.' );
		_doing_it_wrong( __FUNCTION__, $error_message, '6.4' );
		return sprintf(
					/* translators: %s: wp_remove_surrounding_empty_script_tags() */
					__( 'Function %s used incorrectly in PHP.' ),
				) . ' ' . $error_message



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