php function strspn() that returns a string containing the number of characters specified in the charlist parameter

Example

Returns the number of characters "kHlleo" contained in String "Hello world!":

Definition and usage

The strspn() function returns the number of characters in a string containing the number of characters specified in the charlist parameter.

Tip: Please use the strcspn() function to return the number of characters searched in a string before any specified character is found.

Note: This function is binary safe.

Syntax

strspn(string,charlist,start,length)

Technical details

更多实例

实例 1

返回在字符串 "abcdefand" 中包含字符 "abc" 的数目：

表头文件 #includebbed3fed50f96ac7490cfc6a498c4bc5　　

定义函数 size_t strspn (const char *s,const char * accept);　　

函数说明 strspn()从参数s 字符串的开头计算连续的字符，而这些字符都完全是accept所指字符串中的字符。简单的说，若strspn()返回的数值为n，则代表字符串s 开头连续有n个字符都是属于字符串accept内的字符。　　

返回值 返回字符串s开头连续包含字符串accept内的字符数目。

范例

1 #include 　　
2 #include 　　
3 main()　　
4 {　　
5 char *str="Linux was first developed for 386/486-based pcs.";　　
6 printf("%d\n",strspn(str,"Linux"));　　
7 printf("%d\n",strspn(str,"/-"));　　
8 printf("%d\n",strspn(str,"1234567890"));　　
9 }　　运行结果：　　
5  //包含linux字符切　　
0  // 开始不包含　　
0   //开始不包含

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