Indexes for matches for usage in preg_*() functions.

Description

The format of the string is, with empty matches property value, ‘$NUM’.
The ‘NUM’ will be replaced with the value in the $number parameter. With the matches property not empty, the value of the returned string will contain that value of the matches property. The format then will be ‘$MATCHES[NUM]’, with MATCHES as the value in the property and NUM the value of the $number parameter.

Parameters

$numberintrequired

Index number.

Return

Source

public function preg_index( $number ) {
	$match_prefix = '$';
	$match_suffix = '';

	if ( ! empty( $this->matches ) ) {
		$match_prefix = '$' . $this->matches . '[';
		$match_suffix = ']';
	}

	return "$match_prefix$number$match_suffix";
}

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