How can typographical errors in PHP code, such as using incorrect quotation marks, affect the functionality of a script?

Typographical errors in PHP code, such as using incorrect quotation marks, can lead to syntax errors and cause the script to fail. To solve this issue, make sure to use the correct quotation marks (single or double) consistently throughout the code.

// Incorrect quotation marks
$variable = "Hello';

// Corrected code with consistent double quotation marks
$variable = "Hello";