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"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP

arrays php variables warnings undefined-index

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How do JavaScript closures work?

javascript variables closures function scope

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What is the scope of variables in JavaScript?

javascript variables function scope var

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"Variable" variables in JavaScript

javascript variables variable-variables

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How to use a variable for a key in a JavaScript object literal?

javascript variables jquery properties object-literal

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