php array value empty check

basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Gets the value of the array Array_keys ($arr), gets the key name of the array array_flip ($arr), and the values in the array are exchanged with the key

: This article mainly introduces php programming notes. if you are interested in PHP tutorials, please refer to them. Three methods for php to obtain POST data Php image watermarking source code Php + ajax + json is the simplest example. Php Chinese

Php programming notes-three methods for obtaining POST data from small_123 php Php image watermarking source code Php + ajax + json is the simplest example. Php Chinese character to pinyin source code Php traverses the Directory, generates the md5

Three ways to get post data from PHP PHP image plus watermark source code One of the simplest examples of Php+ajax+json PHP Chinese Pinyin Source code PHP iterates through directories, generates MD5 values for each file in the directory, and writes

Php basic knowledge Summary (1) array, basic knowledge array I. Sorting1. asort-Positive Sorting to maintain the index relationship2. arsort-reverse sorting to maintain the index relationship3. sort -- sorting from the lowest to the highest4. ksort -

Php basic knowledge summary (1) array, basic knowledge array. Php basic knowledge summary (1) array, basic knowledge array 1, sorting 1, asort -- forward sorting, maintaining the index relationship 2, arsort -- reverse sorting, maintain the index

Through learning the PHP language, you should know that it is a function-based HTML scripting language. The huge function library supports the implementation of PHP functions. Next we will introduce the usage of PHP functions isset () and empty.

empty-Check if a variable is empty Statement a bug description BOOL Empty (mixed $var) Empty () returns FALSE if Var is a non-null or Non-zero value. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any

PHPisset () and empty () usage differences. The isset () function of PHP is generally used to check whether the variable is set in the format boolisset (mixedvar [, mixedvar [,...]). function: checks whether a return value is set for a variable. if

Php array function Learning Record 2 1. check whether the given key name or index exists in the array -- array_key_exists Usage: array_key_exists ($ key (mixed), $ input (array) returns TRUE and FALSE $input_array=array("1"=>"java","op"=>"R","act"