How can the issue of "Use of undefined constant" errors be resolved in PHP scripts?

The issue of "Use of undefined constant" errors in PHP scripts can be resolved by enclosing the constant name in quotes to treat it as a string. This ensures that PHP does not treat the constant as a constant but as a string literal, preventing the error. 

// Incorrect usage causing "Use of undefined constant" error
echo PI;

// Corrected usage with constant name enclosed in quotes
echo 'PI';

Keywords

PHP constant error define syntax

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