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Typing

strval($m) returns the string value of $m. floatval($m) returns the float value of $m. intval($m[,$i]) returns the integer value of $m, using base $i. 

<!DOCTYPE html>
<html>
<head></head>
<body>
<?php
echo intval(042)."<br />";
echo intval('042')."<br />";
echo intval(123e2)."<br />";
echo intval('123e2')."<br />";
echo intval('111',2)."<br />";
echo intval([])."<br />";
echo intval([1])."<br />";
?> 
</body>
</html>

34
42
12300
123
7
0
1
gettype($m) returns the type of $m as a string, which can be “boolean”, “integer”, “double”, “string”, “array”, “object”, “resource”, “NULL”, or “unknown type”. settype($m,$s) sets the type of $m to $s, which can be “boolean”, ”integer”, ”float”, ”string”,
”array”, ”object” or ”null”. get_resource_type($r) returns the resource type as a string.