Php uses strpos to locate a string

Source: Internet
Author: User
This article mainly introduces how to use strpos to find the position of a string in php. The example analyzes the functions and usage skills of strpos, which has some reference value, for more information about how to use strpos to find the position of a string, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

Strpos is used to find the position where a string appears for the first time in another string. strpos is case-sensitive. if not found, false is returned. Therefore, strpos has two types of return values: integer, one is the bool type, which requires attention during development.

<? Phpecho strpos ("Hello world! "," Wo ");?>

Output result: 6

Because strpos has two types of return values, it is best to use === three equal signs to strictly compare the types when determining whether to find the substring.

<? Php $ haystack = "needle23423432"; $ pos = strpos ($ haystack, "needle"); if ($ pos = false) {print ("Not found (=) test \ n ");} else {print (" Found based (=) test \ n ");} if ($ pos = false) {print ("Not found based (==) test \ n");} else {print ("Found based (==) test \ n");}?>

The above code returns the following results:

This script will print: Not found based (=) testFound based (=) test The (=) test is correct.

I hope this article will help you with php programming.

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