Php converts html tags into legal html code programs-PHP source code

Ec (2); & nbsp; copy the code functionihtmlspecialchars ($ string) {& nbsp; if (is_array ($ string) & nbsp ;{& nbsp; & nbsp; foreach ($ stringas $ key & gt; $ val) & nbsp; {& nbsp; script ec (2); script

The Code is as follows:
Function ihtmlspecialchars ($ string) { If (is_array ($ string )) { Foreach ($ string as $ key => $ val) { $ String [$ key] = ihtmlspecialchars ($ val ); } } Else { $ String = preg_replace ('/& (# (d {3, 5} | x [a-fa-f0-9] {4 }) | [a-za-z] [a-z0-9] {2, 5});)/',' & \ 1 ', Str_replace (array ('&', '"', '<', '>'), array ('&', '"', '<', '> '), $ string )); } Return $ string; }

// Instance

The Code is as follows:
$ Str = 'dfdfs '; Echo ihtmlspecialchars ($ str ); Echo' '; // Echo <a href = "www.111cn.net"> dfdfd </a> to prevent some unsafe factors. Echo htmlspecialchars ($ str ); // Print <a href = "www.111cn.net"> dfdfd </a>

/*
The two results are identical, so I personally think that the built-in functions of php are more efficient than user-defined functions.
*/
?>