How to determine whether there is this value in the array in php

In PHP, you can use the in_array() function to determine whether an array contains a certain value.

The in_array() function receives two parameters: the value to be found and the array to search.

The following is an example of using the in_array() function to determine whether an array contains a certain value:

<?php $fruits = array(&#39;apple&#39;, &#39;banana&#39;, &#39;orange&#39;, &#39;grape&#39;);
if (in_array(&#39;banana&#39;, $fruits)) {
    echo "数组中包含了banana";
} else {
    echo "数组中没有包含banana";
}
?>

The above code first defines an array named $fruits, which contains Names of four fruits. Then use the in_array() function to determine whether the array $fruits contains the value 'banana'. If it is included, then output "the array contains banana"; otherwise, output "the array does not contain banana".

You can also use the array_search() function to determine whether the array contains a certain value. The array_search() function receives two parameters: the value to be found and the array to search.

The following is an example of using the array_search() function to determine whether an array contains a certain value:

<?php $fruits = array(&#39;apple&#39;, &#39;banana&#39;, &#39;orange&#39;, &#39;grape&#39;);
$result = array_search(&#39;banana&#39;, $fruits);
if ($result !== false) {
    echo "数组中包含了banana，它的键值为" . $result;
} else {
    echo "数组中没有包含banana";
}
?>

The above code first defines an array named $fruits, which contains Names of four fruits. Then use the array_search() function to determine whether the array $fruits contains the value 'banana'. If included, the output is "banana is included in the array and its key value is X"; otherwise, the output is "banana is not included in the array". Among them, X is the key value of the value in the array.

Summary:

Whether you use the in_array() function or the array_search() function, it is very simple to determine whether the array contains a certain value. Just pass in the value you want to find and the array you want to search as parameters. At the same time, both functions have return values. The in_array() function returns a Boolean value indicating whether the value exists in the array; the array_search() function returns the key value of the value in the array, and returns false if it does not exist.

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