How to Check if an Array Value Exists?

In PHP programs, it is possible to check whether or not an array value existed before. You just have to use the array function. If you want to check if an array key exists, then use the key() function. If you want to check for arrays with lengths greater than 1 then the size() function would be useful for this purpose.

check if array has value php

By AllenAllen on Jan 21, 2020 
$myArr = [38, 18, 10, 7, "15"];

echo in_array(10, $myArr); // TRUE
echo in_array(19, $myArr); // TRUE

// Without strict check
echo in_array("18", $myArr); // TRUE
// With strict check
echo in_array("18", $myArr, true); // FALSE

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19

php in array

By GrepperGrepper on Jul 01, 2019 
$colors = array("red", "blue", "green"); 
 
if (in_array("red", $colors)) { 
	echo "found red in array"; 
}

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14

in_array php

By Zidane (Vi Ly - VietNam)Zidane (Vi Ly - VietNam) on Oct 02, 2020 
<?php
$os = array("Apple", "Banana", "Lemon");
if (in_array("Apple", $os)) {
    echo "Yeah. Exist Apple";
}
if (!in_array("Buleberry", $os)) {
    echo "Oh, Don't Exist Blueberry!!!";
}
?>

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12

javascript dedupe array

By Yawning YakYawning Yak on Feb 14, 2020 
const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let x = (names) => names.filter((v,i) => names.indexOf(v) === i)
x(names); // 'John', 'Paul', 'George', 'Ringo'

Source: wsvincent.com

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3

in_array

By Joyous JaguarJoyous Jaguar on Nov 10, 2020 
<?php
  $os = array("Mac", "NT", "Irix", "Linux");
  if (in_array("Irix", $os)) {
      echo "Got Irix";
  }
  if (in_array("mac", $os)) {
      echo "Got mac";
  }
?>

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2

php in array

By Amused AnteaterAmused Anteater on Aug 19, 2020 
In array

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-1

Deciding whether an array value exists is useful in many programming situations, such as remembering which element in an array corresponds to a particular key on a form.

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