Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "how to judge whether an element is in the array or not in php". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Method: 1, the use of in_array () function, you can detect whether there is a specified element value in the array, syntax "in_array (element value, array)"; 2, use array_search () function, you can search the specified element value in the array, syntax "array_search (element value, array)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Determine whether an element is in the array in php

Method 1: use the in_array () function

The in_array () function looks up whether a value is included in the array, returns TRUE if it exists, or FALSE if it doesn't exist. The syntax format is as follows:

In_array ($needle, $array [, $strict = FALSE])

The parameters are described as follows:

$needle: the value to be searched. If $needle is a string, it is case-sensitive when comparing.

$array: the array to be searched

$strict: optional parameter. Default is FALSE.

If $strict is empty or FALSE, the in_array () function simply checks whether the value of $needle is equal to the value in $array

If the value of $strict is TRUE,in_array (), the function not only checks the values in $needle and $array, but also compares whether their types are equal.

Tip: the in_array () function is only suitable for finding an element in an one-dimensional array, not recursively looking for elements of each dimension in the array.

Example: use the in_array () function to determine whether an array contains a value

2. Use the array_search () function

The array_search () function searches the array for a key value and returns the corresponding key name.

If the specified key value is found in the array, the corresponding key name is returned, otherwise FALSE is returned. If the key value is found more than once in the array, the key name that matches the first found key value is returned.

The syntax format of this function is as follows:

Array_search ($needle, $haystack [, $strict = false])

The parameters are described as follows:

$needle: is the value to be searched. If $needle is a string type, it is case-sensitive when searching.

$haystack: is an array

$strict: optional parameter, which can be empty. Default is False.

If $strict is False, array_search () compares only values, not types, when searching for $needle in $haystack.

If $strict is True, array_search () compares both values and types when searching for $needle in $haystack.

? >

This is the end of the content of "how to determine whether an element is in an array in php". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.