Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?

phpscope
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How do I pass variables and data from PHP to JavaScript?

javascriptphp
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How can I sort arrays and data in PHP?

arraysphpobjectsortingspl
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Why does this PDO statement silently fail?

phppdo
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The 3 different equals

phpcomparisonoperators
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