In PHP there is no need to write the variable type before the variable because it is loosely-typed. It takes datatype from user defined values that are stored in it. Arrays in PHP is a type of data structure that allows to store multiple elements of similar data type under a single variable thereby saving the effort of creating a different variable for every data.
There are basically three types of arrays in PHP:
- Sequential (Indexed) arrays
- Associative arrays
- Multidimensional arrays
Sequential Arrays: Those arrays which have numerical indexes in an ordered sequential manner (starting from 0 and ending with n-1) are called Sequential or Indexed arrays. In PHP, by default array Indexed array.
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Associative arrays: The arrays which are having string type keys instead of indexes or which exist in (‘key’, ‘value’)pairs are called associative arrays.
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How to check if PHP array is associative or sequential?
There is no inbuilt method in PHP to know the type of array. If the sequential array contains n elements then their index lies between 0 to (n-1). So find the array key value and check if it exist in 0 to (n-1) then it is sequential otherwise associative array.
Array is associative
- === It returns True if $x and $y are equal and same type.
- !== It returns True if $x and $y are not equal or not same type.
- == It returns True if $x and $y are equal.
- != It returns True if $x not equal to $y.
- How to remove a key and its value from an associative array in PHP ?
- How to loop through an associative array and get the key in PHP?
- Multidimensional Associative Array in PHP
- How to get numeric index of associative array in PHP?
- Convert an object to associative array in PHP
- Iterate associative array using foreach loop in PHP
- PHP program to add item at the beginning of associative array
- How to access an associative array by integer index in PHP?
- Associative Arrays in PHP
- Sequential Functionality in Node
- Indexed Sequential Search
- How to check whether an array is empty using PHP?
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