To replace variables in string with their values defined in php, you can use the strtr() or preg_replace_callback() function.

Example with strtr()

- Click to select it.
<?php
// array with data for the variables added in string
$data = array(
  '{$site}'=>'https://coursesweb.net/',
  '{$year}'=>date('Y')
);
$str = 'Code-snippets from {$site} , added in: {$year}.';

$str2 = strtr($str, $data);
echo $str2;      // Code-snippets from https://coursesweb.net/ , added in: 2014.

Example with preg_replace_callback()

- Click to select it.
<?php
// array with data for the variables added in string
$data = array(
  'id'=>'test2',
  'domain'=>'CoursesWeb.net'
);
$str = '<div id="{$id}">Parse this string, interpret {$domain} </div>';


$str2 = preg_replace_callback('/{\$([^}]+)}/', function($m) {
  GLOBAL $data;
  return $data[$m[1]];
}, $str);

echo $str2;      // <div id="test2">Parse this string, interpret CoursesWeb.net </div>
- It is important to define data for variables into an Array with the keys that match the form you added the variable in string. Interpreting variables in string can also be useful to create and use template page; see this tutorial: Create and Use in PHP a Simple Template Page.

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute specifies the HTTP method (GET, POST) used to submit the form-data?
action method value
<form action="script.php" method="post"> ... </form>
Which CSS property allows to add shadow to boxes?
background-image box-shadow border-radius
#id {
  background-color: #bbfeda;
  box-shadow: 11px 11px 5px #7878da;
}
Which function removes the first element from an array?
pop() push() shift()
var fruits = ["apple", "apricot", "banana"];
fruits.shift();
alert(fruits.length);           // 2
Indicate the function that can be used to check if a PHP extension is instaled.
function() filetype() extension_loaded()
if(extension_loaded("PDO") === true) echo "PDO is available."
Interpret / Parse / Replace variable in string with value

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