How can you combine an empty() check with a regular expression in PHP for the desired result?

When combining an empty() check with a regular expression in PHP, you can first use the empty() function to check if a variable is empty or not. If the variable is not empty, you can then use a regular expression to validate the content of the variable. This approach ensures that you are first checking if the variable has any value before applying the regular expression pattern. 

// Example code snippet combining empty() check with a regular expression
$variable = "example123";

if (!empty($variable) && preg_match('/^[a-zA-Z0-9]+$/', $variable)) {
    echo "Variable is not empty and matches the regular expression pattern.";
} else {
    echo "Variable is empty or does not match the regular expression pattern.";
}

Keywords

empty regular expression PHP validation pattern

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