How can incorrect usage of quotation marks in PHP code lead to errors or unexpected behavior?

Incorrect usage of quotation marks in PHP code can lead to syntax errors or unexpected behavior because PHP interprets single quotes ('') and double quotes ("") differently. If a string is enclosed in single quotes but contains variables or escape sequences that need to be evaluated, it will not be parsed correctly. To avoid this issue, use double quotes when including variables or escape sequences within a string. Example PHP code snippet: 

// Incorrect usage of single quotes
$name = 'John';
echo 'Hello, $name'; // Output: Hello, $name

// Corrected code using double quotes
$name = 'John';
echo "Hello, $name"; // Output: Hello, John

Keywords

PHP quotation marks syntax error string manipulation unexpected behavior

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