PHP _php tutorial for finding where strings appear by Strpos

Php method for finding where a string appears by Strpos

This article mainly introduces PHP through Strpos find the method of the location of the string, the example analyzes the function of Strpos and the use of skills, with a certain reference value, the need for friends can refer to the next

This example describes how PHP finds the location of a string by Strpos. Share to everyone for your reference. The specific analysis is as follows:

Strpos is used to find the first occurrence of a string in another string, Strpos is case-sensitive, and if not found, returns false, so Strpos has two types of return values, one for shaping, and one for bool, which requires attention during development

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Echo Strpos ("Hello world!", "Wo"); ?>

Output results: 6

Since Strpos has two types of return values, it is best to use the = = = three equals sign for strict type equality comparisons when determining if substrings are found.

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$haystack = "needle23423432"; $pos = Strpos ($haystack, "needle"); if ($pos ==false) { Print ("not found based (= =) test\n"); } else { Print ("Found based (= =) test\n"); } if ($pos ===false) { Print ("not found based (= = =) test\n"); } else { Print ("Found based (= = =) test\n"); } ?>

The above code returns the following result

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This script would print: Not found based (= =) test Found based (= = =) Test The (= = =) test is correct.

I hope this article is helpful to everyone's PHP programming.

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