How Can I Efficiently Check if a PHP Variable Matches Multiple Values?

Utilizing PHP's Conditional Statements with Multiple Evaluation Criteria

In PHP, determining whether a variable matches any of several predefined values often arises in coding scenarios. While sequential comparisons using && are possible, there are more concise and efficient methods to approach this challenge.

To illustrate, consider a variable $var and the task of displaying "true" if it equals any of "abc," "def," "hij," "klm," or "nop."

In-Array Function: An Elegant Solution

A refined approach involves constructing an array on the fly and leveraging the in_array() function:

if (in_array($var, array("abc", "def", "ghi")))

This technique efficiently checks if $var exists within the specified array, returning true if present and false otherwise.

Switch Statement: An Alternative Approach

Alternatively, a switch statement offers another viable solution:

switch ($var) {
case "abc":
case "def":
case "hij":
    echo "yes";
    break;
default:
    echo "no";
}

By examining the $var value via a series of case statements, the switch construct facilitates targeted responses to specific values. Following each match, a break statement terminates further evaluation, ensuring clarity in code logic.

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