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Which of the following is NOT a valid variable name in PHP?$_variable$1_variable$variable$my_variable

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Which of the following is NOT a valid variable name in PHP?$_variable$1_variable$variable$my_variable
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Solution 1

1variableisNOTavalidvariablenameinPHP.InPHP,avariablestartswiththe1_variable is NOT a valid variable name in PHP. In PHP, a variable starts with the sign, followed by the name of the variable. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: Knowee AI is a powerful AI-powered study tool designed to help you to solve study problem.

Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
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