Detailed introduction to array_keys function

array_keys Returns part or all of the key name descriptions in the array array array_keys (array $array [, mixed $search_value [, bool $strict = false ]] )array_keys() Returns the number or string in the $array array Key name. If the optional parameter search_value is specified, only the key name of the value is returned. Otherwise all keys in the $array array will be returned. Detailed explanation of parameters Return value Returns all keys in array. Example 100 , "color" => "red" ); print_r (array_keys&n

1. php array_keys returns the key name of the array

Introduction: The array_keys function in PHP is used to return a new array containing all the key names in the array. This article introduces the use of the PHP array_keys function in detail. Coders who need it can refer to it

2. php array function sequence array_values() Functions and methods to obtain array element values

Introduction: The array_keys() function returns a new array containing all the key names in the array. If the second parameter is provided, only the key names with the key value are returned

3. php array function sequence array_keys() - Get the array key name

Introduction: The array_keys() function returns a new array containing all the key names in the array. If the second parameter is provided, only the key names with the key value are returned

4. php array function sequence array_keys() - Get the array key name

Introduction: The array_keys() function returns a new array containing all the keys in the array. If the second parameter is provided, only the keys with the value

5 are returned. . PHP Common Functions

#Introduction: Array function array_chunk //Split an array into multiple The array array_key_exists // check whether the given key name or index existing in the array array_keys // return all the key names in the array, and form a new array array_merge // merge one or more arrays to rebuild the index array_va ...

6. php accurately determines whether it is an index array

##Introduction: function is_assoc($arr){ return array_keys($arr) !== range(0, count($arr) - 1); // array_values($arr) !== $arr } function is_assoc2 ($array) { return (bool)count(array_filter(array_keys($a...

7.

php accurately determines whether it is an index array

Introduction: function is_assoc($arr){ return array_keys($arr) !== range(0, count($arr ) - 1); // array_values($arr) !== $arr } function is_assoc2($array) { return (bool)count(array_filter(array_keys($a...

8. Get the key value of the last element of the array

Introduction::This article mainly introduces getting the key of the last element of the array Value, students who are interested in PHP tutorials can refer to it.

9. php keyword replacement class avoids repeated substitutions, retains and restores the original link

Introduction:: This article mainly introduces the PHP keyword replacement class to avoid repeated replacement, retain and restore the original link. Students who are interested in PHP tutorials can refer to it.

10. Analysis of array_keys and array_unique from PHP source code

Introduction::This article mainly introduces the analysis of array_keys and array_unique from PHP source code Source code analysis of array_keys and array_unique, students who are interested in PHP tutorials can refer to it.

【Related Q&A recommendations】：

phpcms reported array_keys error

php - Please tell me the characters How to automatically add single quotes to strings in SQL statements...

javascript - Array.keys related questions

The above is the detailed content of Detailed introduction to array_keys function. For more information, please follow other related articles on the PHP Chinese website!