WordPress at a glance
function is not described

smilies_init() WP 2.2.0

Convert smiley code to the icon graphic file equivalent.

You can turn off smilies, by going to the write setting screen and unchecking the box, or by setting 'use_smilies' option to false or removing the option.

Plugins may override the default smiley list by setting the $wpsmiliestrans to an array, with the key the code the blogger types in and the value the image file.

The $wp_smiliessearch global is for the regular expression and is set each time the function is called.

The full list of smilies can be found in the function and won't be listed in the description. Probably should create a Codex page for it, so that it is available.

Hooks from the function
Return

Null. Nothing.

Usage

smilies_init();

Notes

  • Global. Array. $wpsmiliestrans
  • Global. Array. $wp_smiliessearch

Changelog

Since 2.2.0 Introduced.

Code of smilies init: wp-includes/functions.php WP 5.4.2

<?php
function smilies_init() {
	global $wpsmiliestrans, $wp_smiliessearch;

	// Don't bother setting up smilies if they are disabled.
	if ( ! get_option( 'use_smilies' ) ) {
		return;
	}

	if ( ! isset( $wpsmiliestrans ) ) {
		$wpsmiliestrans = array(
			':mrgreen:' => 'mrgreen.png',
			':neutral:' => "\xf0\x9f\x98\x90",
			':twisted:' => "\xf0\x9f\x98\x88",
			':arrow:'   => "\xe2\x9e\xa1",
			':shock:'   => "\xf0\x9f\x98\xaf",
			':smile:'   => "\xf0\x9f\x99\x82",
			':???:'     => "\xf0\x9f\x98\x95",
			':cool:'    => "\xf0\x9f\x98\x8e",
			':evil:'    => "\xf0\x9f\x91\xbf",
			':grin:'    => "\xf0\x9f\x98\x80",
			':idea:'    => "\xf0\x9f\x92\xa1",
			':oops:'    => "\xf0\x9f\x98\xb3",
			':razz:'    => "\xf0\x9f\x98\x9b",
			':roll:'    => "\xf0\x9f\x99\x84",
			':wink:'    => "\xf0\x9f\x98\x89",
			':cry:'     => "\xf0\x9f\x98\xa5",
			':eek:'     => "\xf0\x9f\x98\xae",
			':lol:'     => "\xf0\x9f\x98\x86",
			':mad:'     => "\xf0\x9f\x98\xa1",
			':sad:'     => "\xf0\x9f\x99\x81",
			'8-)'       => "\xf0\x9f\x98\x8e",
			'8-O'       => "\xf0\x9f\x98\xaf",
			':-('       => "\xf0\x9f\x99\x81",
			':-)'       => "\xf0\x9f\x99\x82",
			':-?'       => "\xf0\x9f\x98\x95",
			':-D'       => "\xf0\x9f\x98\x80",
			':-P'       => "\xf0\x9f\x98\x9b",
			':-o'       => "\xf0\x9f\x98\xae",
			':-x'       => "\xf0\x9f\x98\xa1",
			':-|'       => "\xf0\x9f\x98\x90",
			';-)'       => "\xf0\x9f\x98\x89",
			// This one transformation breaks regular text with frequency.
			//     '8)' => "\xf0\x9f\x98\x8e",
			'8O'        => "\xf0\x9f\x98\xaf",
			':('        => "\xf0\x9f\x99\x81",
			':)'        => "\xf0\x9f\x99\x82",
			':?'        => "\xf0\x9f\x98\x95",
			':D'        => "\xf0\x9f\x98\x80",
			':P'        => "\xf0\x9f\x98\x9b",
			':o'        => "\xf0\x9f\x98\xae",
			':x'        => "\xf0\x9f\x98\xa1",
			':|'        => "\xf0\x9f\x98\x90",
			';)'        => "\xf0\x9f\x98\x89",
			':!:'       => "\xe2\x9d\x97",
			':?:'       => "\xe2\x9d\x93",
		);
	}

	/**
	 * Filters all the smilies.
	 *
	 * This filter must be added before `smilies_init` is run, as
	 * it is normally only run once to setup the smilies regex.
	 *
	 * @since 4.7.0
	 *
	 * @param string[] $wpsmiliestrans List of the smilies' hexadecimal representations, keyed by their smily code.
	 */
	$wpsmiliestrans = apply_filters( 'smilies', $wpsmiliestrans );

	if ( count( $wpsmiliestrans ) == 0 ) {
		return;
	}

	/*
	 * NOTE: we sort the smilies in reverse key order. This is to make sure
	 * we match the longest possible smilie (:???: vs :?) as the regular
	 * expression used below is first-match
	 */
	krsort( $wpsmiliestrans );

	$spaces = wp_spaces_regexp();

	// Begin first "subpattern".
	$wp_smiliessearch = '/(?<=' . $spaces . '|^)';

	$subchar = '';
	foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
		$firstchar = substr( $smiley, 0, 1 );
		$rest      = substr( $smiley, 1 );

		// New subpattern?
		if ( $firstchar != $subchar ) {
			if ( '' != $subchar ) {
				$wp_smiliessearch .= ')(?=' . $spaces . '|$)';  // End previous "subpattern".
				$wp_smiliessearch .= '|(?<=' . $spaces . '|^)'; // Begin another "subpattern".
			}
			$subchar           = $firstchar;
			$wp_smiliessearch .= preg_quote( $firstchar, '/' ) . '(?:';
		} else {
			$wp_smiliessearch .= '|';
		}
		$wp_smiliessearch .= preg_quote( $rest, '/' );
	}

	$wp_smiliessearch .= ')(?=' . $spaces . '|$)/m';

}