June 19th, 2013, 11:08 AM
About a small code
Hello,I am novice in PHP.I just got a doubt going on a piece of code.
3 printf("%s </br>",$key);
In line 1, key($capitals) returns a string not a boolean value and it is just an assignment not "==".I am confused how this statement worked.
June 19th, 2013, 11:23 AM
key() returns null when it hits the end of the array. If you put an assignment inside a control structure's condition, whatever got assigned is used as the check. PHP's atomic operations, themselves, have boolean value. You can say:
$a = ($b = key($c);
$a and $b would be identical in this scenario. This behavior is often used as a shortcut to replace:
while ( null !== ( $a = key($c) ) )
Since key() returns null when it hits the end of the array, the result of the assignment will be null, which in PHP is == false (thanks to loose typing) and the while loop will halt when the array runs out. Technically what you have is valid, but as you've discovered it's confusing.
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June 19th, 2013, 11:36 AM