instr(string ,substring) -- 返回substring首次在string中出现的位置 concat(string [,...]) -- 连接字串 charset(str) -- 返回字串字符集 lcase(string) -- 转换成小写 left(string, length) -- 从string2中的左边起取length个字符 load_file(file_name) -- 从文件读取内容 locate(substring, string [...
“` 2. 使用substring函数:substring函数也可用于截取字符串,但与substr函数略有不同。它需要指定字符串的起始位置和结束位置(而不是长度)。例如,要获取字符串$str中从第3个字符到第7个字符之间的部分,可以使用以下代码: “` $middle = substr($str, 2, 5); “` 3. 使用正则表达式:如果你想要根据某种模式...
pattern 用于搜索的模式, 字符串形式. subject 输入字符串 limit 如果指定, 将限制分隔得到的子串最多只有limit个, 返回的最后一个 子串将包含所有剩余部分.limit值为-1, 0或null时都代表"不限制", 作为php的标准, 你可以使用null跳过对flags的设置.
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 positionincluding0), you can use either of: !== FALSE (recommended) > -1 (...
substr_count() Counts the number of times a substring occurs in a string. substr_replace() Replaces a part of a string with another string. trim() Removes whitespace (or other characters) from the beginning and end of a string. ucfirst() Converts the first character of a string to uppe...
"the matches will be stored in the elements of the array regs. $regs[1] will contain the substring which starts at the first left parenthesis; $regs[2] will contain the substring starting at the second, and so on. $regs[0] will contain a copy of the complete string matched. " ...
method returns the position of the first occurrence of a substring in a string. If the substringdoes not exist within the string, false is returned: use IlluminateSupport\Str; $position = Str::of('Hello, World!')->position('Hello'); // 0 $position = Str::of('Hello, World!')->...
The function returns a part of a string. The first parameter is the specified string. The second parameter is the start of the substring. The third parameter is optional. It is the length of the returned substring. The default is to the return until the end of the string. ...
; example, if you set output_handler to “mb_output_handler”, character ; encoding will be transparently converted to the specified encoding. ; Setting any output handler automatically turns on output buffering. ; Note: People who wrote portable scripts should not depend on this ini ...
substr_count()Counts the number of times a substring occurs in a string substr_replace()Replaces a part of a string with another string trim()Removes whitespace or other characters from both sides of a string ucfirst()Converts the first character of a string to uppercase ...