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<documentation title="Array Bracket Spacing">
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When referencing arrays you should not put whitespace around the opening bracket or before the closing bracket.
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<code title="Valid: No spaces around the brackets.">
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$foo<em></em>[<em></em>'bar'<em></em>];
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<code title="Invalid: Spaces around the brackets.">
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$foo<em> </em>[<em> </em>'bar'<em> </em>];