PHP 0 "" Null Maximum difference of empty

PHP 0 "" Null Maximum difference of empty

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PHP 0 "" Null Maximum difference of empty

See: http://stackoverflow.com/questions/137487/null-vs-false-vs-0-in-php

The main area is type, two is in the comparison, the above answer, I will not duplicate.

and empty, should be empty () it

In addition to the previous list, 0.0, "0", empty array, variable without value

PHP == is a lot of people spit groove, so building the main use === , this will not confuse 0 "" null the equivalent of the region.

0, ', null empty () is true
0, ' isset () is True,null isset () is False

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