wp_is_mobile() │ WP 3.4.0

Test if the current browser runs on a mobile device (smart phone, tablet, etc.)

1 time — 0.000012 sec (very fast) | 50000 times — 0.04 sec (speed of light) | PHP 7.0.8, WP 4.6.1
Hooks from the function

Return

true|false.

Usage

wp_is_mobile();

Examples

0

#1 Check if the user is logged in from a mobile device 

if( wp_is_mobile() ) {
	// here we perform actions only for mobile devices.
}
0

#2 A more complete check

Code from http://detectmobilebrowsers.com/

function is_mobile() {

	$useragent = $_SERVER['HTTP_USER_AGENT'];

	if(
		// add '|android|ipad|playbook|silk' to the first regular to also define tablet
		preg_match(
			'/' .
			'(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|' .
			'fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|' .
			'netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|' .
			'symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino' .
			'/i',
			$useragent
		)
		||
		preg_match(
			'~' .
			'1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|' .
			'as(te|us)|attw|au(di|-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br([ev])w|bumb|bw-([nu])|' .
			'c55/|capi|ccwa|cdm-|cell|chtm|cldc|cmd-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc-s|devi|dica|dmob|' .
			'do([cp])o|ds(12|-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly([_-])|g1 u|g560|' .
			'gene|gf-5|g-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd-([mpt])|hei-|hi(pt|ta)|hp( i|ip)|hs-c|' .
			'ht(c([ _agpst-])|tp)|hu(aw|tc)|i-(20|go|ma)|i230|iac([ /-])|ibro|idea|ig01|ikom|im1k|' .
			'inno|ipaq|iris|ja([tv])a|jbro|jemu|jigs|kddi|keji|kgt([ /])|klon|kpt |kwc-|kyo([ck])|le(no|xi)|' .
			'lg( g|/([klu])|50|54|-[a-w])|libw|lynx|m1-w|m3ga|m50/|ma(te|ui|xo)|mc(01|21|ca)|m-cr|me(rc|ri)|' .
			'mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t([ ov-])|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30([02])|' .
			'n50([025])|n7(0([01])|10)|ne(([cm])-|on|tf|wf|wg|wt)|nok([6i])|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan([adt])|' .
			'pdxg|pg(13|-([1-8]|c))|phil|pire|pl(ay|uc)|pn-2|po(ck|rt|se)|prox|psio|pt-g|qa-a|qc(07|12|21|32|60|-[2-7]|i-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55/|sa(ge|ma|mm|ms|ny|va)|sc(01|h-|oo|p-)|sdk/|se(c([-01])|47|' .
			'mc|nd|ri)|sgh-|shar|sie([-m])|sk-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h-|v-|v )|sy(01|mb)|' .
			't2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl-|tdg-|tel([im])|tim-|t-mo|to(pl|sh)|ts(70|m-|m3|m5)|tx-9|' .
			'up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|-v)|' .
			'vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c([ -])|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas-|your|zeto|zte-' .
			'~i',
			substr( $useragent, 0, 4 )
		)
	){
		return true;
	}

	return false;
}

Speed: 50,000 times = 0.26307 sec. = fast

Changelog

Since 3.4.0 Introduced.

Code of wp_is_mobile() WP 5.9.3

wp-includes/vars.php 
function wp_is_mobile() {
	if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
		$is_mobile = false;
	} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) !== false // Many mobile devices (all iPhone, iPad, etc.)
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Android' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Silk/' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Kindle' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) !== false ) {
			$is_mobile = true;
	} else {
		$is_mobile = false;
	}

	/**
	 * Filters whether the request should be treated as coming from a mobile device or not.
	 *
	 * @since 4.9.0
	 *
	 * @param bool $is_mobile Whether the request is from a mobile device or not.
	 */
	return apply_filters( 'wp_is_mobile', $is_mobile );
}

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