How to Efficiently Check if a PHP Variable Matches Any of Multiple Values?

Multiple Conditions in PHP If Statements

When evaluating multiple conditions in PHP's if statements, there's a need to efficiently check if a variable matches any of a given set of values.

Question:

Consider a variable $var. Echo "true" if $var equals "abc", "def", "hij", "klm", or "nop" in a single statement, similar to &&.

Answer:

There are several ways to achieve this:

1. Array and in_array():

An elegant approach is to create an array on the fly and use the in_array() function:

if (in_array($var, array("abc", "def", "ghi"))) {
    // Code to execute when $var matches any of the values
}

2. Switch Statement:

Another option is the switch statement:

switch ($var) {
    case "abc":
    case "def":
    case "hij":
        // Code to execute when $var matches any of the specific cases
        break;
    default:
        // Code to execute when $var doesn't match any of the cases
}

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