How to query which array data is in in php

In PHP, querying whether data exists in an array is a common task. Querying whether data exists in an array can be achieved by using some built-in PHP functions, including in_array() and array_search().

Use the in_array() function to check whether data exists in an array

The in_array() function is one of the PHP built-in functions used to determine whether a specific value exists in an array. The in_array() function takes two parameters, the first parameter is the value being checked, and the second parameter is the array to be checked.

For example, the following code shows how to use the in_array() function to check whether a specific value exists in an array:

$fruits = array("apple", "banana", "orange", "grape");

if (in_array("banana", $fruits)) {
    echo "Banana exists in the array.";
} else {
    echo "Banana doesn't exist in the array.";
}

This code will output "Banana exists in the array." because "banana " exists in the $fruits array.

Use the array_search() function to find the index position of a value

The array_search() function is another commonly used PHP function, used to find the position of a specific value in an array. If the value does not appear in the array, the function returns false. If the value exists in the array, the function returns the index position of the first occurrence of the value.

The following is a sample code that shows how to use the array_search() function to find the position of a specific value in an array:

$fruits = array("apple", "banana", "orange", "grape");

$position = array_search("orange", $fruits);

if ($position !== false) {
    echo "Orange exists in the array at position: " . $position;
} else {
    echo "Orange doesn't exist in the array.";
}

This code will output "Orange exists in the array at position: 2 ", because "orange" is in the third position in the $fruits array.

Conclusion

Querying whether a specific value exists in an array is a common task in PHP. This can be accomplished simply in PHP by implementing one of the built-in functions such as in_array() and array_search(). Therefore, mastering these functions can effectively improve development efficiency.

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