Access array element by value

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8 Answers

valueaccesselementarray
90%

You can stick to your for loop. There are not big differences between it and other methods – the array has always to be traversed linearly. That said, you can use these functions to find array pairs with a certain value:, Ah, this makes me understand a bit better. I'm storing a lot of data in session, so I don't have to query for it each time I need to access it. Is this bad practice? – Brandon Frohbieter Jun 17 '10 at 18:08 ,I think i'm being thick, but to get the attributes of an array element if I know the value of one of the keys, I'm first looping through the elements to find the right one. , Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers

If searching for the exact same array it will work, not it you have other values in it:

< ? php
$arr = array(
   array('name' => 'joe'),
   array('name' => 'bob'));
var_dump(array_search(array('name' => 'bob'), $arr));
//works: int(1)
$arr = array(
   array('name' => 'joe', 'a' => 'b'),
   array('name' => 'bob', 'c' => 'd'));
var_dump(array_search(array('name' => 'bob'), $arr));
//fails: bool(false)
?
>

If there are other keys, there is no other way then looping as you already do. If you only need to find them by name, and names are unique, consider using them as keys when you create the array:

< ? php
$arr = array(
   'joe' => array('name' => 'joe', 'a' => 'b'),
   'bob' => array('name' => 'bob', 'c' => 'd'));
$arr['joe']['a'] = 'bbb'; ?
>
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88%

Note: You can also use property accessors to access other properties of the array, like with an object.,Array prototype methods can be used on strings as well, since they provide sequential access to their characters in a similar way to arrays:,A common operation is to iterate over the values of an array, processing each one in some way. The simplest way to do this is as follows:,Note: In the above code, arrayLength must be a Number. Otherwise, an array with a single element (the provided value) will be created. Calling arr.length will return arrayLength, but the array doesn't contain any elements. A for...in loop will not find any property on the array.

let arr = new Array(element0, element1, ..., elementN)
let arr = Array(element0, element1, ..., elementN)
let arr = [element0, element1, ..., elementN]
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72%

Array elements can be accessed using the array[key] syntax. ,Example #7 Accessing array elements, Because the value of an array can be anything, it can also be another array. This enables the creation of recursive and multi-dimensional arrays. , It is possible to compare arrays with the array_diff() function and with array operators.

An array can be created using the array() language construct. It takes any number of comma-separated key => value pairs as arguments.

array(
   key => value,
   key2 => value2,
   key3 => value3,
   ...
)
array(1) {
   [1] =>
   string(1)
   "d"
}
array(4) {
   ["foo"] =>
   string(3)
   "bar" ["bar"] =>
   string(3)
   "foo" [100] =>
   int(-100)[-100] =>
      int(100)
}
array(4) {
   [0] =>
   string(3)
   "foo" [1] =>
   string(3)
   "bar" [2] =>
   string(5)
   "hello" [3] =>
   string(5)
   "world"
}
array(4) {
   [0] =>
   string(1)
   "a" [1] =>
   string(1)
   "b" [6] =>
   string(1)
   "c" [7] =>
   string(1)
   "d"
}
array(7) {
   [1] =>
   string(1)
   "g" [-1] =>
   string(1)
   "d" ["01"] =>
   string(1)
   "e" ["1.5"] =>
   string(1)
   "f" [0] =>
   string(1)
   "h" [""] =>
   string(1)
   "j" [2] =>
   string(1)
   "l"
}
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65%

You access an array element by referring to the index number:,An array can hold many values under a single name, and you can access the values by referring to an index number.,With JavaScript, the full array can be accessed by referring to the array name:,You should use arrays when you want the element names to be numbers.

const cars = ["Saab", "Volvo", "BMW"];
let x = ;
75%

If you want to access an individual value form an indexed, associative or multidimensional array you can either do it through using the array index or key.,Is this website helpful to you? Please give us a like, or share your feedback to help us improve. Connect with us on Facebook and Twitter for the latest updates.,How to print or echo all the values of an array in PHP,How to remove duplicate values from an array in PHP

<?php
// Indexed array
$sports = array("Baseball", "Cricket", "Football", "Shooting");
 
// Associative array
$cities = array("France"=>"Paris", "India"=>"Mumbai", "UK"=>"London", "USA"=>"New York");
 
// Multidimensional array
$superheroes = array(
    array(
        "name" => "Peter Parker",
        "character" => "Spider-Man",
    ),
    array(
        "name" => "Tony Stark",
        "character" => "Iron-Man",
    ),
    array(
        "name" => "Clark Kent",
        "character" => "Super-Man",
    )
);
 
echo $sports[0]; // Outputs: Baseball
echo "<br>";
echo $sports[1]; // Outputs: Cricket
echo "<br>";
echo $cities["France"]; // Outputs: Paris
echo "<br>";
echo $cities["USA"]; // Outputs: New York
echo "<br>";
echo $superheroes[0]["name"]; // Outputs: Peter Parker
echo "<br>";
echo $superheroes[1]["character"]; // Outputs: Iron-Man
?>
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A new element can be inserted at the start of the array using the array_shift() function which takes the array name and the value to be added as arguments:,The above echo command will output the value in index position 1 of the array, in this case the string "Yellow".,The echo will output "Wyke" which is in the author column of the second row of the array.,2 Accessing Elements in a PHP Array

We can create an empty array as follows:

< ? php
$colorArray = array(); ?
>
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Using the slice method,Retrieve the last element using negative index array.slice(-1) ,Use array slice() to return a specific element ,We continue with Flexiple's tutorial series to explain the code and concept behind common use cases. In this article, we will solve for a specific case: "To check if a value exists in an array". We then also look at its implementation in Javascript and jQuery.


let arry = [2, 4, 6, 8, 10, 12, 14, 16];
let lastElement = arry[arry.length - 1];

console.log(lastElement);

//Output: 16
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When a C++ program is compiled, a symbol table is generated simultaneously. It is formed to store the corresponding values of the address of all the variables used in the program.,Let us consider a C++ program and see what will the symbol table for the corresponding program:,So, from the symbol table, it can be seen that every variable is assigned an address. Therefore, when the array is initialized, it also gets some address. In the table, an array gets stored in form of a pointer pointing towards the first element. ,What are the default values of static variables in C?

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