如何在 PHP 中有效地將變數與多個值進行比較？

Comparing Multiple Values in PHP: A Simplified Approach

The problem arises when comparing multiple values to a single variable using multiple if statements, which can lead to redundancy and reduced readability. The dilemma stems from the desire to compare values succinctly, similar to the = operator found in XQuery.

Solution: Utilizing in_array()

PHP offers a simple solution through its in_array() function. This function allows you to create an array of values and then check if a given variable exists within that array.

Implementation

To achieve the desired simplification, you can follow these steps:

1. Create an array of the values you wish to compare:

$checkVars = array(3, 4, 5, "string", "2010-05-16");

2. Use the in_array() function to check if the variable matches any value in the array:

if(in_array($var, $checkVars)){
    // Value is found within the array.
}

By utilizing in_array(), you can replace the verbose if-else statements with a single, concise comparison, enhancing both readability and efficiency in your code. Refer to the PHP documentation for more information on in_array():

http://uk.php.net/manual/en/function.in-array.php

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