To check if a particular variable does exist or, we are going to use PHP isset(). It will return TRUE if the variable exists and return FALSE if it does not exist. Below is the syntax: isset(VARIABLE_NAME) Now
Which methods are available in PHP to check if a variable or an array key is defined? Check with isset(): Isset() can be used to check whether a variable has already been defined. <?php $a = 50; $b = 0; $str = ''; var_dump(isset($a)); // true var_dump(isset($b)); ...
PHP code to check whether a string contains a specific character<?php // We will get the email from form and // store in email variable $email = $_POST["email"]; // Inside if, we check using strpos function if (strpos($email, "@") !== false) { print "There was @ in the ...
fastcgi_split_path_info 在 Nginx 官方文档的描述是这样的 :Module ngx_http_fastcgi_module Defines a regular expression that captures a value for the$fastcgi_path_infovariable. The regular expression should have two captures: the first becomes a value of the$fastcgi_script_namevariable, the second ...
exists Description: Verify if the specified key exists. Parameters key Return value long: The number of keys tested that do exist. Examples $redis->set('key', 'value'); $redis->exists('key'); /* 1 */ $redis->exists('NonExistingKey'); /* 0 */ $redis->mset(['foo' => 'foo'...
PHP empty() function : The php empty() function is used to check if variable is empty or not. The empty() function returns true or false.
Note that the value portion of the cookie will automatically be urlencoded when you send the cookie, and when it is received, it is automatically decoded and assigned to a variable by the same name as the cookie name. If you don't want this, you can use setrawcookie() instead if you...
if( __nx_all('foo', 'bar', 'baz') ) // false // check if one variable exists if( __x_one('foo', 'bar') ) // true if( __x_one('', null) ) // false if( __x_one(['foo', 'bar']) ) // true if( __x_one...
This is because Laravel will check for errors in the session data, and automatically bind them to the view if they are available. The $errors variable will be an instance of Illuminate\Support\MessageBag. For more information on working with this object, check out its documentation....
// 指定x-oss-forbid-overwrite为false时,表示允许覆盖同名Object。// 指定x-oss-forbid-overwrite为true时,表示禁止覆盖同名Object,如果同名Object已存在,则报错FileAlreadyExists。$options=array(OssClient::OSS_HEADERS=>array('x-oss-forbid-overwrite'=>'true'),...