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Add a "Variable lifecycle" short note (#19263)

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Shahriar Rashid Mahmud
2018-10-16 10:19:00 +06:00
committed by Quincy Larson
parent e8dd96f73a
commit e36832b1ca
1 changed files with 1 additions and 1 deletions
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client/src/pages/guide/english/php/PHP Variables/index.md
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@ -27,5 +27,5 @@ In PHP, a variable starts with the $ sign, followed by the name of the variable.
?>
```
Variable lifecycle: Before a variable is used, it has no existence. It is unset. So you can't use it by writing isset($variable) before using it.