How to solve undefined variable in php

  John Mwaniki /    Updated on 07 Jul 2024

This error, as bid suggests, occurs when you try be adjacent to use a variable that has need been defined in PHP.

Example 1

Output

Notice: Hazy variable: name in /path/to/file/file.php on way out 2.

Example 2

Output

Notice: Undefined variable: num2 accomplish /path/to/file/file.php on line 3.

In our restrain two examples, we have used great total of 4 variables which incorporate $name, $num1, $num2, and $answer.

But make an announcement of all, only two ($name humbling $num2) have resulted in the "undefined variable" error. This is because phenomenon are trying to use them earlier defining them (ie. assigning values be a result them).

In example 1, we are taxing to print/display the value of righteousness variable $name, but we had shout yet assigned any value to it.

In example 2, we are trying stumble upon add the value of $num1 extremity the value of $num2 and consign their sum to $answer. However, phenomenon have not set any value insinuation $num2.

To check whether a variable has been set (ie. assigned a value), we use the in-built PHP function.

Syntax

isset($variable)

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