How to solve PHP error: unexpected '$' symbol?

How to solve PHP error: unexpected "$" symbol?

PHP is a widely used programming language that is often used to develop websites and web applications. However, when writing PHP code, we often encounter various errors and errors. This article will focus on a common error, the "unexpected "$" sign", and provide ways to resolve it.

What is the "unexpected "$" sign" error?

In PHP, variables start with the $ symbol, such as $variable. If an invalid $ sign appears in the code, the PHP interpreter will report an error and prompt "Unexpected "$" sign". This error is usually caused by the following reasons:

1. Variable name writing error: The variable name may be spelled incorrectly or use illegal characters.
2. Syntax error: There may be a syntax error in the code, resulting in the use of variables that does not comply with PHP syntax specifications.
3. Missing quotation marks or semicolons: There may be missing quotation marks or semicolons in the code, causing PHP parsing errors.

Solution:

1. Check the spelling and usage of variable names: First, carefully check the variable names involved in the code to ensure that their spelling is correct. Check whether there are any characters that do not comply with PHP variable naming rules, such as special characters or spaces that are not allowed. Make sure variable names are quoted correctly and called where needed.

Example:

$var1 = "Hello";
$var2 = 123;

echo $var1; // 输出"Hello"
echo $var2; // 输出123

In this example, $var1 and $var2 are valid variable names and they are both quoted and used correctly.

2. Check for syntax errors: Using the syntax highlighting function of the code editor can help us quickly find possible syntax errors. Make sure there are no missing key characters such as semicolons, parentheses or curly braces in the code, and check whether the code complies with PHP syntax specifications.

Example:

if ($condition) { // 缺少了右花括号 }
    echo "Condition is true"; 
}

In this example, due to the missing right curly brace, an "unexpected "$" symbol" error will be reported. We can fix this error by simply adding a closing curly brace.

3. Check quotation marks and semicolons: Quotation marks and semicolons are very important punctuation marks in PHP. They are used to indicate the beginning and end of a string and mark the end of a statement. Make sure each string is properly wrapped in quotes and each statement ends with a semicolon.

Example:

$name = "John; // 缺少了右引号 "
$age = 25

echo "My name is ".$name." and I'm ".$age." years old";

In this example, due to the missing closing quotation mark, an "unexpected "$" symbol" error will be reported. We simply add a closing quote after the closing quote on the definition line of the $name variable and a semicolon after the definition line of the $age variable to resolve this error.

Summary:

It is not uncommon to encounter "unexpected "$" sign" errors when writing PHP code, but we can do this by carefully checking the use of variable names, syntax, and punctuation. to resolve this error. I hope the solutions provided in this article can help you solve this problem and improve your PHP programming skills.

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