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run code in 150+ php & hhvm versions
Bugs & Features
<?php # basic test string_lt('a', 'z'); string_lt('z', 'a'); # numeric strings string_lt('22', '123'); string_lt('123', '22'); # non-numeric strings string_lt('bb', 'abc'); string_lt('abc', 'bb'); # non-numeric strings with numbers in # should be the same as "numeric strings" if strcmp() really does string comparison string_lt('22x', '123x'); string_lt('123x', '22x'); function string_lt($str1, $str2) { # you can't use < operator for comparing strings # wacky stuff will happen $lt_says = ((string) $str1 < (string) $str2); # see what strcmp() says $strcmp_says = strcmp($str1, $str2); echo "$str1 less than $str2; lt_says: $lt_says, strcmp_says: $strcmp_says\n"; }
based on jPTBC
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
a less than z; lt_says: 1, strcmp_says: -25 z less than a; lt_says: , strcmp_says: 25 22 less than 123; lt_says: 1, strcmp_says: 1 123 less than 22; lt_says: , strcmp_says: -1 bb less than abc; lt_says: , strcmp_says: 1 abc less than bb; lt_says: 1, strcmp_says: -1 22x less than 123x; lt_says: , strcmp_says: 1 123x less than 22x; lt_says: 1, strcmp_says: -1
Output for hhvm-3.10.0 - 3.12.0
a less than z; lt_says: 1, strcmp_says: -1 z less than a; lt_says: , strcmp_says: 1 22 less than 123; lt_says: 1, strcmp_says: 1 123 less than 22; lt_says: , strcmp_says: -1 bb less than abc; lt_says: , strcmp_says: 1 abc less than bb; lt_says: 1, strcmp_says: -1 22x less than 123x; lt_says: , strcmp_says: 1 123x less than 22x; lt_says: 1, strcmp_says: -1