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$value = htmlentities($_POST ['stringposted']);

Very easy my friends…

All this is actually information is easily obtainable from the manual http://php.net/manual/en/function.str-replace.php

$digits = array(“1″, “2″, “3″);
$digitsAsWords = array(“one”, “two”, “three”);
$phrase = “It’s easy as 1, 2, 3.”;

$newphrase = str_replace($digits, $digitsAsWords, $phrase);
// Provides: “It’s easy as one, two, three.”;

$array_of_special_chars=array(“ñ”,”Á”,”á”,”É”); //you must put all the array elements, here’s only the first 4
$array_of_equivalents=array(“ñ”,”Á”,”á”,”É”); //same as above
//The order is very important, also both arrays must be the same size
for ($i=0;$i<sizeof($array_of_special_chars);$i++) $string=str_replace($array_of_special_chars[$i],$array_of_equivalents[$i],$string);