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bool settype ( mixed &$var , string $type )

<?php
$foo = "5bar"; // string
$bar = true;   // boolean
var_dump($foo);
var_dump($bar);
settype($foo, "integer"); // $foo is now 5 (integer)
settype($bar, "string");  // $bar is now "1" (string)
var_dump($foo);
var_dump($bar);
?>

string(4) "5bar"
bool(true)
int(5)
string(1) "1"