The PHP Documentation Group has now added the Appendix K. PHP type comparison tables to the official PHP manual.
Empty() & Co, Special Values
Note: empty() and isSet() don't give a warning when the variable has not been defined before. |
comparison with ==
true | false | 1 | 0 | -1 | "1" | "0" | "-1" | "1.3" | "1.30" | 1.3 | 1.30 | array() | "foo" | "" | |
true | true | false | true | false | true | true | false | true | true | true | true | true | false | true | false |
false | false | true | false | true | false | false | true | false | false | false | false | false | true | false | true |
1 | true | false | true | false | false | true | false | false | false | false | false | false | false | false | false |
0 | false | true | false | true | false | false | true | false | false | false | false | false | false | true | true |
-1 | true | false | false | false | true | false | false | true | false | false | false | false | false | false | false |
"1" | true | false | true | false | false | true | false | false | false | false | false | false | false | false | false |
"0" | false | true | false | true | false | false | true | false | false | false | false | false | false | false | false |
"-1" | true | false | false | false | true | false | false | true | false | false | false | false | false | false | false |
"1.3" | true | false | false | false | false | false | false | false | true | true | true | true | false | false | false |
"1.30" | true | false | false | false | false | false | false | false | true | true | true | true | false | false | false |
1.3 | true | false | false | false | false | false | false | false | true | true | true | true | false | false | false |
1.30 | true | false | false | false | false | false | false | false | true | true | true | true | false | false | false |
array() | false | true | false | false | false | false | false | false | false | false | false | false | true | false | false |
"foo" | true | false | false | true | false | false | false | false | false | false | false | false | false | true | false |
"" | false | true | false | true | false | false | false | false | false | false | false | false | false | false | true |
comparison with ===
true | false | 1 | 0 | -1 | "1" | "0" | "-1" | "1.3" | "1.30" | 1.3 | 1.30 | array() | "foo" | "" | |
true | true | false | false | false | false | false | false | false | false | false | false | false | false | false | false |
false | false | true | false | false | false | false | false | false | false | false | false | false | false | false | false |
1 | false | false | true | false | false | false | false | false | false | false | false | false | false | false | false |
0 | false | false | false | true | false | false | false | false | false | false | false | false | false | false | false |
-1 | false | false | false | false | true | false | false | false | false | false | false | false | false | false | false |
"1" | false | false | false | false | false | true | false | false | false | false | false | false | false | false | false |
"0" | false | false | false | false | false | false | true | false | false | false | false | false | false | false | false |
"-1" | false | false | false | false | false | false | false | true | false | false | false | false | false | false | false |
"1.3" | false | false | false | false | false | false | false | false | true | false | false | false | false | false | false |
"1.30" | false | false | false | false | false | false | false | false | false | true | false | false | false | false | false |
1.3 | false | false | false | false | false | false | false | false | false | false | true | true | false | false | false |
1.30 | false | false | false | false | false | false | false | false | false | false | true | true | false | false | false |
array() | false | false | false | false | false | false | false | false | false | false | false | false | true | false | false |
"foo" | false | false | false | false | false | false | false | false | false | false | false | false | false | true | false |
"" | false | false | false | false | false | false | false | false | false | false | false | false | false | false | true |
来源:http://www.blueshoes.org/en/developer/php_cheat_sheet/
参考:http://www.php.net/manual/en/types.comparisons.php
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