PHP Tutorial - PHP settype() function

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We can use PHP's settype() function to change the type of a variable while preserving the variable's value.

Syntax

Parameter

Possibles values of type are:

• "boolean" or "bool"
• "integer" or "int"
• "float"
• "string"
• "array"
• "object"
• "null"

Return

Returns TRUE on success or FALSE on failure.

Example

At first $test_var variable contains 1.23, a floating - point value.

Next, $test_var is converted to a string, which means that the number 1.23 is now stored using the characters 8, . , 2 , and 3.

After converting $test_var to an integer type, it contains the value 8; the fractional part of the number has been lost.

Finally, after converting $test_var to a Boolean, it contains the value true (which PHP displays as 1 ). This is because PHP converts a non - zero number to the Boolean value true.

<?PHP/*  w  w  w  .j a  va2  s . co  m*/
         $test_var = 1.23; 
         echo $test_var . "\n";         // Displays "1.23" 
         settype( $test_var, "string" ); 
         echo $test_var . "\n";         // Displays "1.23" 
         settype( $test_var, "integer" ); 
         echo $test_var . "\n";         // Displays "8" 
         settype( $test_var, "float" ); 
         echo $test_var . "\n";         // Displays "8" 
         settype( $test_var, "boolean" ); 
         echo $test_var . "\n";         // Displays "1"   
?>

The code above generates the following result.

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