php find duplicate values in associative array

1. The concept of arrays An array is a named range that is used to store a series of variable values. Each array element has an associated index (also a keyword) that can be used to access elements. PHP allows you to use numbers or strings evenly

PHP has a lot of functions about arrays to facilitate array manipulation. Defined: Each entity of an array contains two items: key and value, which can be retrieved by a query key. These keys can be numeric (numerical) or associated (associative)

Learn PHP's array summary "experience", PHP array Summary PHP has a lot of functions for arrays, which makes it easy to manipulate arrays. Defined: The array contains two items per entity: Key and value, which can be obtained by querying the key.

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

First, create a new arrayThe array has no size limit, so you can create an array simply by creating a reference, for example: $state [0]= ' 111 '; $state [1]= ' 222 '; If the index value is a numeric index and is incremented, the index value can

This article for everyone to share the basic knowledge of PHP array functions for your reference, the specific contents are as follows Array arrays are very important data types. It is more like a structure than other data types, and the result

Array pointer operation: Moves the array pointer operation: Next () down Gets the value of the current element. Prev () will also get the value of the current element. End () moves to the last element cell to get the value of the last element reset (

Recently just internship, often used in the array of PHP, so summarize, not at any time to random search.First: basic knowledgePHP supports numeric indexed arrays and associative arrays, and associative arrays allow more meaningful data, such as

Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (if

Subscript: The identifying name in the array is the code of the string or integer in the array Several index values in an array are referred to as several-dimensional arrays. Index value: An index is a structure that sorts the values of one or more