1 check if string contains any character other than what's allowed 1 How to detect wrongly encoded strings in PHP 0 Checking a character on a string 0 Checking to see if a string contains any characters 0 how to verify that a string contains a character 0 Checking if a string ha...
<?php /** * returns an array of positions and substrings of needle that were found * in string haystack using a minimal and maximal substring length * * @param unknown $haystack find substrings of needle in this string * @param unknown $needle substrings in needle will be searche...
The single parameter this function has takes in the value you want to check if it is numeric. In addition, this function will return a Boolean value (true or false). If the value is a number or a numeric string, the function will returntrue. Otherwise, this function will returnfalse. H...
In version 8.0, two functions have been added to PHP that helps in manipulating a string: Thestr_starts_with()function allows you to check if a string starts with a specific string Thestr_ends_with()function allows you to check if a string ends with a specific string Both functions accept...
This article introduces how to check if a string starts with a specified string in PHP. It includes substr() function, strpos() function and strncmp() function
$checkString mandatory It’s the string that we want to check in the $checkString. $offset optional It’s the start position of the search process; if the offset is negative, the search process will start from the end. This function returns the position of the substring relative to the ...
The is_string PHP function is used to check if a value is a string. It returns true or false. A string contains text and numbers treated as text.
$myString="";if(empty($myString)){echo"string is empty";}else{echo"string is not empty";} Output: "string is empty" Similarly, we can also use thestrlen()function to check for an empty string in PHP. $myString="";if(strlen($myString)==0){echo"string is empty";}else{echo"str...
//check_admin()用于检查当前用户权限,如果是admin设置$is_admin变量为true,然后下面判断此变量是否为true,然后执行管理的一些操作。 //ex1.php if(check_admin()) { $is_admin=true; } if($is_admin) { do_something(); } ?> 这一段代码没有将$is_admin事先初始化为Flase,如果register_globals为On,...
* @param string $field 字段名 * @param mixed $rules 验证规则 * @param mixed $value 字段值 * @param array $message 提示信息 * @return mixed*/publicfunctioncheckItem(string$field,$rules,$value,$message='') {foreach($rulesas$k=>$v){$result=$this->is($k,$value,$v);if($result==...