What is an example of an associative array in php?
In this tutorial you'll learn how to store multiple values in a single variable in PHP. Show
What is PHP ArraysArrays are complex variables that allow us to store more than one value or a group of values under a single variable name. Let's suppose you want to store colors in your PHP script. Storing the colors one by one in a variable could look something like this:
But what, if you want to store the states or city names of a country in variables and this time this not just three may be hundred. It is quite hard, boring, and bad idea to store each city name in a separate variable. And here array comes into play. Types of Arrays in PHPThere are three types of arrays that you can create. These are:
Indexed ArraysAn indexed or numeric array stores each array element with a numeric index. The following examples shows two ways of creating an indexed array, the easiest way is:
Note: In an indexed or numeric array, the indexes are automatically assigned and start with 0, and the values can be any data type. This is equivalent to the following example, in which indexes are assigned manually:
Associative ArraysIn an associative array, the keys assigned to values can be arbitrary and user defined strings. In the following example the array uses keys instead of index numbers:
The following example is equivalent to the previous example, but shows a different way of creating associative arrays:
Multidimensional ArraysThe multidimensional array is an array in which each element can also be an array and each element in the sub-array can be an array or further contain array within itself and so on. An example of a multidimensional array will look something like this:
Viewing Array Structure and ValuesYou can see the structure and values of any array by using one of two statements —
The
Array ( [0] => London [1] => Paris [2] => New York ) This output shows the key and the value for each element in the array. To get more information, use the following statement:
This array(3) { [0]=> string(6) "London" [1]=> string(5) "Paris" [2]=> string(8) "New York" } This output shows the data type of each element, such as a string of 6 characters, in addition to the key and value. In the next chapter you will learn how to sort array elements. You will learn how to loop through the values of an array in the later chapter. What is a PHP Array?A PHP array is a variable that stores more than one piece of related data in a single variable. Think of an array as a box of chocolates with slots inside. 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 ArraysNumeric 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 Or value, …); ?> HERE,
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: Once upon a time in China Eastern Condors 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. "Shaolin Monk", 1 => "Drunken Master", 2 => "American Ninja", 3 => "Once upon a time in China", 4 =>"Replacement Killers" ); echo $movie[4]; ?> Output: Replacement Killers Associative array differ from numeric array in the sense that associative arrays use descriptive names for id keys. Below is the syntax for creating associative array in php. value); ?> HERE,
Let’s suppose that we have a group of persons, and we want to assign the gender of each person against their names. We can use an associative array to do that.The code below helps us to do that. "Female", "John" => "Male", "Mirriam" => "Female"); print_r($persons); echo ""; echo "Mary is a " . $persons["Mary"]; ?> HERE,
Output: Array ( [Mary] => Female [John] => Male [Mirriam] => Female ) Mary is a Female Associative array are also very useful when retrieving data from the database. The field names are used as id keys. PHP Multi-dimensional arraysThese are arrays that contain other nested arrays. The advantage of multidimensional arrays is that they allow us to group related data together. Let’s now look at a practical example that implements a php multidimensional array. The table below shows a list of movies by category.
The above information can be represented as a multidimensional array. The code below shows the implementation. array("Pink Panther", "John English", "See no evil hear no evil"), "action" => array("Die Hard", "Expendables"), "epic" => array("The Lord of the rings"), "Romance" => array("Romeo and Juliet") ); print_r($movies); ?> HERE,
Output: Array ( [comedy] => Array ( [0] => Pink Panther [1] => John English [2] => See no evil hear no evil ) [action] => Array ( [0] => Die Hard [1] => Expendables ) [epic] => Array ( [0] => The Lord of the rings ) [Romance] => Array ( [0] => Romeo and Juliet ) ) Another way to define the same array is as follows array( 0 => "Pink Panther", 1 => "john English", 2 => "See no evil hear no evil" ), "action" => array ( 0 => "Die Hard", 1 => "Expendables" ), "epic" => array ( 0 => "The Lord of the rings" ), "Romance" => array ( 0 => "Romeo and Juliet" ) ); echo $film["comedy"][0]; ?> Output: Pink Panther Note: the movies numeric array has been nested inside the categories associative array PHP Arrays: Operators
PHP Array FunctionsCount functionThe count function is used to count the number of elements that an php array contains. The code below shows the implementation. Output: 3 is_array functionThe is_array function is used to determine if a variable is an array or not. Let’s now look at an example that implements the is_array functions. Output: 1 SortThis function is used to sort arrays by the values. If the values are alphanumeric, it sorts them in alphabetical order. If the values are numeric, it sorts them in ascending order. It removes the existing access keys and add new numeric keys. The output of this function is a numeric array "Female", "John" => "Male", "Mirriam" => "Female"); sort($persons); print_r($persons); ?> Output: Array ( [0] => Female [1] => Female [2] => Male ) ksortThis function is used to sort the array using the key. The following example illustrates its usage. "Female", "John" => "Male", "Mirriam" => "Female"); ksort($persons); print_r($persons); ?> Output: Array ( [John] => Male [Mary] => Female [Mirriam] => Female ) asortThis function is used to sort the array using the values. The following example illustrates its usage. "Female", "John" => "Male", "Mirriam" => "Female"); asort($persons); print_r($persons); ?> Output: Array ( [Mary] => Female [Mirriam] => Female [John] => Male ) Why use arrays?
Summary
Which is a example of associative array *?Example. $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000"); echo "Sonoo salary: ".
What are the types of array in PHP with example?In PHP, there are three types of arrays: Indexed arrays - Arrays with a numeric index. Associative arrays - Arrays with named keys. Multidimensional arrays - Arrays containing one or more arrays.
Are all arrays in PHP associative?PHP treats all arrays as associative, so there aren't any built in functions.
Is $_ POST an associative array?The $_POST is an associative array of variables.
These variables can be passed by using a web form using the post method or it can be an application that sends data by HTTP-Content type in the request.
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