Removes leading and trailing _empty_ script tags.
Description
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.
Example:
// 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
Parameters
$contentsstringrequired- Script body with manually created SCRIPT tag literals.
Source
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(
'console.error(%s)',
wp_json_encode(
sprintf(
/* translators: %s: wp_remove_surrounding_empty_script_tags() */
__( 'Function %s used incorrectly in PHP.' ),
'wp_remove_surrounding_empty_script_tags()'
) . ' ' . $error_message
)
);
}
}
Changelog
| Version | Description |
|---|---|
| 6.4.0 | Introduced. |
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