What are the potential consequences of not using quotation marks in PHP comparisons?

When not using quotation marks in PHP comparisons, PHP will treat the values as constants or variables. This can lead to unexpected behavior or errors, especially if the constants or variables are not defined. To avoid this issue, always use quotation marks around string values in PHP comparisons. 

// Incorrect way without using quotation marks
$value = 5;
if($value == hello){
    echo "Value is hello";
}

// Correct way using quotation marks
$value = 5;
if($value == 'hello'){
    echo "Value is hello";
}

Keywords

PHP quotation marks comparisons type juggling error types

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