PHP character comparison strcmp () function use method _php Tutorial

The use of the strcmp () function is to compare two strings, and if two strings are exactly equal we return 0, otherwise there will be various return values, this function is case-sensitive and can be referenced by friends who need it.

Return value Description after comparison

Returns 0 if str1 and str2 are equal.
If the str1 is less than str2 return <0 (but not necessarily-1, many of the internet is said to be-1, is not correct, the specific value of the actual situation depends on the size).
If STR1 is greater than str2, the >0 is returned (but not necessarily 1, depending on the actual value).

Cases

The code is as follows	Copy Code
strcmp (Date (' y-m-d ', $user->last_time), date ("Y-m-d", Time ())) = = 0

If you do not distinguish between case

STRNCASECMP is used as part of a case-insensitive comparison string, starting from the beginning of the string, and the third parameter, which is the length to compare:

The code is as follows	Copy Code
Echo strncasecmp ("ABCDD", "ABCDE", 3);

Returns 0, compares ABC and ABC, because it is not case sensitive, so the two are the same

PHP string Comparison We can also use = = to, as

The code is as follows	Copy Code
$a = ' AA '; $b = ' www.bKjia.c0m '; if ($a = = $b) { echo ' equal '; } Else { echo ' unequal '; }

You can also use = = = to compare

The code is as follows	Copy Code
22 = = "22"; Returns True 22 = = = "22"; Returns false

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