What does & mean in php?
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Reference — What does this symbol mean in PHP?
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Are PHP Variables passed by value or by reference?
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'At' symbol before variable name in PHP: @$_POST
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& as a letter in the alphabet?
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Precedence of && over ||
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How do `>` and `>>` work?
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&& operator in Javascript
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What does the ampersand indicate in this bash command 1>&2
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What is the "->" PHP operator called?
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Typing "&" in tables
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Operator precedence for  And/&& in Ruby
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Difference between executing multiple commands with && and ;
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What are :+ and &:+ in Ruby?
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Difference between "and" and && in Ruby?
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What does `` mean in Python?
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Are objects in PHP passed by value or reference?
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What is "?:" notation in JavaScript?