[Single topic] The results of the following programs are: <?php $STR = "Tomorrow Programming Dictionary"; Echo Substr_count ($str, "word");? >

2. 1
4. 3
6. 2
8. 4

Instance

Calculate the number of occurrences of "Shanghai" in a string:

<?phpecho substr_count ("I Love Shanghai". Shanghai is the "biggest city", "Shanghai");? >

Running an instance

The Substr_count () function calculates the number of occurrences of a substring in a string.

Note: Substrings are case-sensitive.

Note: This function does not count overlapping substrings (see Example 2).

Note: If the start parameter plus the length parameter is greater than the string size, the function generates a warning (see Example 3).

Grammar

Substr_count (string,substring,start,length)

Parameters	Description
String	Necessary. Specifies the string to be checked.
Substring	Necessary. Specifies the string to search for.
Start	Optional. Specifies where to start the search in the string.
Length	Optional. Specifies the length of the search.

Technical details

return value:	Returns the number of occurrences of a substring in a string.
PHP version:	4 +
Update log:	In PHP 5.1, the start and length parameters have been added.

More examples of examples 1

Use all the parameters:

String reduction to "s I"?>

Running an instance

Example 2

Overlapping sub-strings:

This function does not count overlapping substrings?>

Running an instance

Example 3

If the start and length parameters exceed the string length, the function outputs a warning:

<?phpecho $str = "This was nice"; Substr_count ($str, ' is ', 3,9);? >

Because the length value exceeds the length of the string (3 + 9 is greater than 12), the use outputs a warning.

Correct answer:

[Single topic] The results of the following programs are: <?php $STR = "Tomorrow Programming Dictionary"; Echo Substr_count ($str, "word");? >