Php query string occurrences function introduction _ PHP Tutorial

Description of the function used to find the number of occurrences of a string in php. You can use the substr_count () function to find the number of occurrences of a string in php. I will introduce these functions to you in detail. Substr_count ($ haystack, $ needle [. you can use the substr_count () function to find the number of occurrences of a string in php. next I will introduce these functions in detail.

Substr_count ($ haystack, $ needle [, $ offset [, $ length])

/$ Haystack indicates the parent string, and $ needl indicates the character to be searched
// $ Offset indicates the start point of the search, and $ length indicates the length of the search, all of which are optional parameters.

Instance:

The code is as follows:
$ Str = "this is a test "; Echo substr_count ($ str, 'is ').' '; Echo substr_count ($ str, 'is ', 3 ).' '; Echo substr_count ($ str, 'is ', 3, 3 ).' '; ?>

Instance:

The code is as follows:
$ Str = 'http: // www.bkjia.com Love program net_getting started with software programming _ Software Design Exchange _ character occurrences '; Echo substr_count ($ str, 'w ').' '; Echo substr_count ($ str, 'T ').' '; Echo substr_count ($ str, 'Love program net '); ?> Output result: // The output result is as follows: 3 2 1

Then share some string lookup functions

Strstr-first appearance of the search string
Stristr strstr case-insensitive version
Strpos-locate the first occurrence of a string
String substr (string $ string, int $ start [, int $ length])
String strrchr (string $ haystack, mixed $ needle)
Strripos-calculate the position of the last occurrence of the specified string in the target string (case insensitive)
Stripos-locate the first occurrence of a string (no size difference)
Strrpos-calculate the position of the last occurrence of the specified string in the target string

The aggregate () function is implemented. I will introduce these functions to you in detail. Substr_count ($ haystack, $ needle [,...