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What is a strpos function?

The STRPOS function is case-sensitive. The position of SubString in String. The STRPOS function returns the position of the first occurrence of the substring. If SubString cannot be found, then the function returns zero. If String or SubString is empty, then the function returns zero. This example shows how to use the STRPOS function.

What is the difference between strpos and strstr in PHP?

PHP has a function strpos with this definition: This function locates a substring needle inside a string haystack and returns the offset from the beginning of the string haystack. C has function strstr that can be used for this purpose and returns a pointer to the substring or NULL if no match is found:

What is the difference between strpos and!== false?

Note that the use of !== false is deliberate (neither != false nor === true will return the desired result); strpos () returns either the offset at which the needle string begins in the haystack string, or the boolean false if the needle isn't found.

How do you know if a substring is absent in strpos?

WARNING As strpos may return either FALSE (substring absent) or 0 (substring at start of string), strict versus loose equivalency operators must be used very carefully. To know that a substring is absent, you must use: === FALSE To know that a substring is present (in any position including 0), you can use either of: !== FALSE (recommended)

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