How do I perform integer division in PHP

December 27, 2011

PHP’s division operator returns a floating point result from the division operator unless both operands are integers and they are evenly divisible (the result is an integer). I was recently working on Project Euler Problem 13 and needed to do integer division, something I haven’t come across in PHP before.

Integer division in PHP is pretty straight forward. Casting the result as an integer will yield an integer. That is:

var_dump(25/7);         // float(3.5714285714286) 
var_dump((int) (25/7)); // int(3)
var_dump(round(25/7));  // float(4) 

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