When to wrap curly braces around a variable

Answers of > When to wrap curly braces around a variable

In the above example, PHP's interpreter w3coded when var considers $vars a variable, but, the variable is w3coded when var $var. To separate a variable name and the other w3coded when var characters inside a string, you can use curly w3coded when var braces. Now, see the above example using curly w3coded when var braces-,Now, there are two ways you can define a w3coded when var variable in a string – simple syntax which is w3coded when var the most used method of defining variables w3coded when var inside a string and complex syntax which uses w3coded when var curly braces to define variables.,When you are w3coded when var defining a variable inside a string, PHP might w3coded when var mix up the variable with other characters if w3coded when var using simple syntax to define a variable and w3coded when var this will produce an error. See the example w3coded when var below:,You know that a string can be specified w3coded when var in four different ways. Two of these ways are w3coded when var – double quote("") and heredoc syntax. You can w3coded when var define a variable in those 2 types of strings w3coded when var and PHP interpreter will parse or interpret that w3coded when var variable too, within the strings.

Curly braces example:

<?php
$lang = "PHP";
echo "You are learning to use curly braces in {$lang}.";
?>

Output:

You are learning to use curly braces in PHP.

When you are defining a variable inside a string, PHP might mix up the variable with other characters if using simple syntax to define a variable and this will produce an error. See the example below:

<?php
$var = "way";
echo "Two $vars to defining variable in a string.";
?>

Output:

Notice: Undefined variable: vars …

In the above example, PHP's interpreter considers $vars a variable, but, the variable is $var. To separate a variable name and the other characters inside a string, you can use curly braces. Now, see the above example using curly braces-

<?php
$var = "way";
echo "Two {$var}s to define a variable in a string.";
?>

Output:

Two ways to define a variable in a string.

Example:

$username_method = 'username';
$realname_method = 'realname';

$username = $user->{$username_method}; // $user->username;
$name = $user->{$realname_method}; // $user->realname

Another Example as per @kapreski's request in the comments.

/**Lets say you need to get some details about the user and store in an 
array for whatever reason.  
Make an array of what properties you need to insert. 
The following would make sense if the properties was massive. Assume it is
**/

$user = $this->getUser(); //Fetching User object

$userProp = array('uid','username','realname','address','email','age');

$userDetails = array();

foreach($userProp as $key => $property) {
    $userDetails[] =  $user->{$property};       
}

print_r($userDetails);

As far as I know, you can use for variable $x

echo "this is my variable value : $x dollars";

… but if you don't have any spaces between the variable and the text around it, you should use {}. For example:

echo "this is my variable:{$x}dollars";

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