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 tag can be used to create input text field in web page?
<form> <input> <div><input type="text" name="a_name" value="val" />
Which CSS property displays the text in a small-caps font?
display font-variant font-styleh3 {
font-variant: small-caps;
}What instruction displays a notice box with a message inside it, in JavaScript?
for() Date() alert()var msg = "Visit CoursesWeb.net";
alert(msg);
Indicate the PHP code used to get the users IP.
$_SERVER["HTTP_USER_AGENT"] $_SERVER["REMOTE_ADDR"] $_GET[]$ip = $_SERVER["REMOTE_ADDR"];
echo $ip;