How to get month between two dates php

I recently needed to calculate age in months ranging from prenatal to 5 years old [60+ months].

Neither of the answers above worked for me. The first one I tried, which is basically a 1 liner for deceze's answer

$bdate = strtotime['2011-11-04']; 
$edate = strtotime['2011-12-03'];
$age = [[date['Y',$edate] - date['Y',$bdate]] * 12] + [date['m',$edate] - date['m',$bdate]];
. . .

This fails with the set dates, obviously the answer should be 0 as the month mark [2011-12-04] hasn't been reached yet, how ever the code returns 1.

The second method I tried, using Adam's code

$bdate = strtotime['2011-01-03']; 
$edate = strtotime['2011-02-03'];
$age = 0;

while [strtotime['+1 MONTH', $bdate] < $edate] {
    $age++;
    $bdate = strtotime['+1 MONTH', $bdate];
}
. . .

This fails and says 0 months, when it should be 1.

What did work for me, is a little expansion of this code. What I used is the following:

$bdate = strtotime['2011-11-04'];
$edate = strtotime['2012-01-04'];
$age = 0;

if[$edate < $bdate] {
    //prenatal
    $age = -1;
} else {
    //born, count months.
    while[$bdate < $edate] {
        $age++;
        $bdate = strtotime['+1 MONTH', $bdate];
        if [$bdate > $edate] {
            $age--;
        }
    }
}

This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters

+2 years 3 months

2 years, 3 months, 21 days, 11 hours, 59 minutes, 1 seconds

Difference between two dates: 103