What potential issue arises when using single quotes around a variable in the strtotime function in PHP?

Using single quotes around a variable in the strtotime function in PHP will treat the variable as a string literal, causing the function to not interpret the variable's value as intended. To solve this issue, you should concatenate the variable within double quotes to ensure its value is properly passed to the function. 

// Incorrect usage with single quotes
$date = '2022-01-01';
$timestamp = strtotime('$date');

// Corrected usage with concatenation
$date = '2022-01-01';
$timestamp = strtotime("$date");

Keywords

single quotes variable strtotime function PHP date parsing

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