A PHP array is a variable that stores more than one piece of related data in a single variable.
What is a PHP Array?
RE: bananasims at hotmail dot com I also needed a work around to not having a new version of PHP and wanting my own keys. Bananasims code doesn't like having an array as the second parameter. As shuffle permanently change the keys of an array. Method 2: Use arrayrand function to get random value out of an array in PHP. PHP arrayrand Function: The arrayrand function is an inbuilt function in PHP which is used to fetch a random number of elements from an array. The element is a key and can return one or more than one key. An array in PHP is actually an ordered map. A map is a type that associates values to keys.This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more.
Think of an array as a box of chocolates with slots inside.
For example, some MySQL functions in PHP are creating such arrays, so that you can simply access the result array via the column names of the respective table. But how is it possible to create such an associative array containing own key-value-pairs in my own PHP code?
The box represents the array itself while the spaces containing chocolates represent the values stored in the arrays.
The diagram below illustrates the above syntax.
In this tutorial, you will learn-
Numeric Arrays
Numeric arrays use number as access keys.
An access key is a reference to a memory slot in an array variable.
The access key is used whenever we want to read or assign a new value an array element.
Below is the syntax for creating numeric array in php. Array Example
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Let’s now look at an example of a numeric array.
Suppose we have 5 movies that we want to store in array variables.
We can use the example shown below to do that.
Here,
Each movie is given an index number that is used to retrieve or modify its value. Observe the following code-
Output:
As you can see from the above examples, working with arrays in PHP when dealing with multiple values of the same nature is very easy and flexible.
Alternatively, the above array variables can also be created using the following code.
Output:
PHP Associative ArrayAssociative array differ from numeric array in the sense that associative arrays use descriptive names for id keys.
Below is the syntax for creating associative array in php.
HERE,
Let’s suppose that we have a group of persons, and we want to assign the gender of each person against their names.
We can use an associative array to do that.The code below helps us to do that.
HERE,
Output:
Associative array are also very useful when retrieving data from the database.
The field names are used as id keys.
PHP Multi-dimensional arraysThese are arrays that contain other nested arrays.
The advantage of multidimensional arrays is that they allow us to group related data together.
Let’s now look at a practical example that implements a php multidimensional array.
The table below shows a list of movies by category.
The above information can be represented as a multidimensional array. The code below shows the implementation.
HERE,
Output:
Another way to define the same array is as follows
Output:
Note: the movies numeric array has been nested inside the categories associative array
PHP Arrays: Operators
PHP Array FunctionsCount function![]()
The count function is used to count the number of elements that an php array contains. The code below shows the implementation.
Output:
is_array function
The is_array function is used to determine if a variable is an array or not. Let’s now look at an example that implements the is_array functions.
Output:
Sort
This function is used to sort arrays by the values.
If the values are alphanumeric, it sorts them in alphabetical order.
If the values are numeric, it sorts them in ascending order.
It removes the existing access keys and add new numeric keys.
The output of this function is a numeric array
Output:
ksort
This function is used to sort the array using the key. The following example illustrates its usage.
Output:
asort
This function is used to sort the array using the values. The following example illustrates its usage.
Output:
Why use arrays?
SummaryPhp Foreach Create Array Key Value
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