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# substr_count

(PHP 4, PHP 5)

substr_count -- Count the number of substring occurrences

## 说明

int substr_count ( string haystack, string needle [, int offset [, int length]] )

substr_count() returns the number of times the needle substring occurs in the haystack string. Please note that needle is case sensitive.

> 注: This function doesn't count overlapped substrings. See the example below!

## 参数

haystack

  The string to search in

needle

  The substring to search for

offset

  The offset where to start counting

length

  The maximum length after the specified offset to search for the substring. It outputs a warning if the offset plus the length is greater than the haystack length.

## 返回值

This functions returns an integer.

## 更新日志

版本 | 说明
--- | ---
5.1.0 | Added the offset and the length parameters

## 范例

例子 1. A substr_count() example

`<?php
$text = 'This is a test';
echo strlen($text); // 14
echo substr_count($text, 'is'); // 2
// the string is reduced to 's is a test', so it prints 1
echo substr_count($text, 'is', 3);
// the text is reduced to 's i', so it prints 0
echo substr_count($text, 'is', 3, 3);
// generates a warning because 5+10 > 14
echo substr_count($text, 'is', 5, 10);
// prints only 1, because it doesn't count overlapped subtrings
$text2 = 'gcdgcdgcd';
echo substr_count($text2, 'gcdgcd');
?>`

## 参见

count_chars()
strpos()
substr()
strstr()

后退 | 起点 | 前进
substr_compare | 上一级 | substr_replace