How can PHP developers avoid the "Notice: Use of undefined constant" error in their code?

PHP developers can avoid the "Notice: Use of undefined constant" error by ensuring that they enclose their array keys or constants in quotes to treat them as strings. This error occurs when PHP interprets a bareword as a constant, and if the constant is not defined, it throws a notice. By using quotes around array keys or constants, developers can prevent this error from occurring. 

// Incorrect code that may trigger the error
$myArray = ['key' => value]; // Notice: Use of undefined constant value - assumed 'value'

// Corrected code with quotes around array key
$myArray = ['key' => 'value']; // No error

Keywords

PHP constant error undefined development

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