What potential issues can arise from accessing variables like $foo[bar] in PHP?

Accessing variables like $foo[bar] in PHP can lead to potential issues if the 'bar' is not defined as a constant or a string. To avoid this problem, you should enclose 'bar' in quotes to treat it as a string key. This ensures that PHP interprets it correctly as an associative array key. 

// Incorrect way to access variable
$foo[bar] = "value";

// Correct way to access variable
$foo['bar'] = "value";

Keywords

array PHP variable syntax error debugging

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