PHP generates a random code with optional digits_PHP tutorial

php generates a random code with optional digits

<?php
echo coding(6);
function coding($num){
	$str_arr = array(&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;,&#39;e&#39;,&#39;f&#39;,&#39;g&#39;,&#39;h&#39;,&#39;i&#39;,&#39;j&#39;,&#39;k&#39;,&#39;l&#39;,&#39;m&#39;,&#39;n&#39;,&#39;o&#39;,&#39;p&#39;,&#39;q&#39;,&#39;r&#39;,&#39;s&#39;,&#39;t&#39;,&#39;u&#39;,&#39;v&#39;,&#39;w&#39;,&#39;x&#39;,&#39;y&#39;,&#39;z&#39;,&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;,&#39;E&#39;,&#39;F&#39;,&#39;G&#39;,&#39;H&#39;,&#39;I&#39;,&#39;J&#39;,&#39;K&#39;,&#39;L&#39;,&#39;M&#39;,&#39;N&#39;,&#39;O&#39;,&#39;P&#39;,&#39;Q&#39;,&#39;R&#39;,&#39;S&#39;,&#39;T&#39;,&#39;U&#39;,&#39;V&#39;,&#39;W&#39;,&#39;X&#39;,&#39;Y&#39;,&#39;Z&#39;,&#39;0&#39;,&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;,&#39;6&#39;,&#39;7&#39;,&#39;8&#39;,&#39;9&#39;);
	$rand_s = array_rand($str_arr,$num);
	$code_s = &#39;&#39;;
	if(is_array($rand_s)){
		foreach($rand_s as $v){
			$code_s .= $str_arr[$v];
		}
		return $code_s;
	}else{
		return $str_arr[&#39;rand_s&#39;];
	}
}
?>

http://www.bkjia.com/PHPjc/1073353.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1073353.htmlTechArticlephp generates a random code with optional digits?phpecho coding(6);function coding($num){ $str_arr = array(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w ,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,...