Get initial letters

function.php

<?php
function initial_letters( $char ){
	// Defaults
	$pos   = 0;
	$saida = '';

	if( !isset( $char ) ){
		trigger_error( "Insert text", E_USER_ERROR );
		return false;
	}
	
	while( ( $pos = mb_strpos( $char, ' ', $pos ) ) !== false ){
		if( isset( $char[$pos + 1] ) && $char[ $pos + 1 ] != ' ' ){
			$saida .= mb_substr( $char, $pos + 1, 1 );
		}

		$pos++;
	}
	return $char[0] . $saida;
}

// Example:

$char = "Lenivene Bezerra";

print initial_letters( $char ); // Return LB