What are the potential pitfalls of using double quotes within an echo statement in PHP?

When using double quotes within an echo statement in PHP, variables within the double quotes will be interpreted and replaced with their values. This can lead to unexpected behavior if the variable names are not properly escaped or do not exist. To avoid this issue, you can either use single quotes within the echo statement or escape the double quotes with a backslash (\). 

// Using single quotes within the echo statement
echo 'This is a "quoted" text';

// Escaping double quotes with a backslash
echo "This is a \"quoted\" text";

Keywords

double quotes echo statement variable interpolation escaping characters security vulnerability

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