Here we will see some of the functions listed below that are removed in PHP7.

1- ASP-style tags ( <%, <%= and %> ), is removed.

2- Script tags "<"script language='php' ">" Note: always use "<"?php ?">".

3-Split function that returns an array of strings after splitting up a string is removed.

4-The ereg extension with all it's ereg_* functions have been deprecated since PHP 5.3 and replaced by PCRE extention.

5- Mysql extention is depricated since 5.5 and hence removed in php7

6-Uniform Variable Syntax

copytext

class A
{
   public $username = 'abcd';
   public $job_type = 'Technical';
}
 
$xyz = new A();
$attributes = ['1' => 'username', '2' => 'job_type'];
echo "\n User name is " . $xyz->$attributes['1'] . "<br>";
echo "\n User Job Type is " . $xyz->$attributes['2'] . "\n\n";
 
OUTPUT:
 
User name is abcd
User Job Type is Technical 

class A
{
   public $username = 'abcd';
   public $job_type = 'Technical';
}

$xyz = new A();
$attributes = ['1' => 'username', '2' => 'job_type'];
echo "\n User name is " . $xyz->$attributes['1'] . "<br>";
echo "\n User Job Type is " . $xyz->$attributes['2'] . "\n\n";

OUTPUT:

User name is abcd
User Job Type is Technical 

In PHP 5, the expression $xyz->$attribute['1'] is evaluated as $xyz->{$attribute['1']}

In PHP 7, the expression $xyz->$attribute['1'] is evaluated as {$xyz->$attribute}['1']

$xyz->{$attribute['1']} gives the same output in PHP 5 and PHP 7

7-Fatal Error with multiple default clauses

switch ($expression) { default: notExecuted(); break; default: executed(); } In PHP 5, the last default would be used in switch. But in PHP 7, switch statements will contain only one default else we will get a Fatal Error in case of PHP7.