When developing a calculator application in PHP, what are some considerations for handling complex mathematical expressions and operator precedence?

When handling complex mathematical expressions and operator precedence in a calculator application in PHP, one consideration is to use the eval() function to evaluate the expression. This function allows for the execution of a string as PHP code, which can handle complex mathematical operations and operator precedence. 

```php
$expression = "3 + 4 * 2";
$result = eval('return ' . $expression . ';');
echo $result;
```

In the code snippet above, we have an expression "3 + 4 * 2" that includes addition and multiplication operators. We use the eval() function to evaluate the expression and store the result in the $result variable, which is then echoed to the output. This approach allows for handling complex mathematical expressions and operator precedence in a calculator application.

Keywords

Mathematical expressions Operator precedence PHP functions Evaluation Parsing

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