What are the ways to find a value in an array in php

Search method: 1. Use the "in_array($search,$arr,$type)" statement; 2. Use the "array_search($search,$arr,$type)" statement; 3. Use "array_key_exists" ($search,$arr)" statement.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php search array Method of a certain value

Method 1: Use the in_array() function

The in_array() function searches whether the specified value exists in the array.

<?php
header("Content-type:text/html;charset=utf-8");
$people = array("Peter", "Joe", "Glenn", "Cleveland");
if(in_array("Glenn",$people)){
  echo "找到指定值";
}else{
  echo "没有找到指定值";
}
?>

Method 2: array_search() function

array_search() function is the same as in_array(), searching for an item in the array key value. If the value is found, the key of the matching element is returned. If not found, returns false.

<?php
$a=array("a"=>"Dog","b"=>"Cat","c"=>5,"d"=>"5");
echo array_search("Dog",$a);
echo array_search("5",$a);
?>

Method 3: Use the array_key_exists() function

array_key_exists() function to check whether the specified key exists in an array name, returns true if the key name exists, false if the key name does not exist.

<?php
header("Content-type:text/html;charset=utf-8");
$a=array("a"=>"Dog","b"=>"Cat");
if(array_key_exists("a",$a)){
    echo "Key exists!";
}else{
    echo "Key does not exist!";
}
?>

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