It helps to checks if a value exists in an array.
in_array()
<?php
$os = array(“Mac”, “Windows”, “Irix”, “Linux”);
if (in_array(“Mac”, $os)) {
echo “Got Mac”;
}
if (in_array(“Mac”, $os)) {
echo “Got Mac”;
}
?>
… Read more How to create a mysql connection in PHP ?
mysql_connect() Open a Connection to the MySQL Server.
Syntax : mysql_connect(servername,username,password);
mysql_connect()
<?php
// Create connection
$con=mysqli_connect(“website.com”,”user”,”password”,”database_name”);
$con=mysqli_connect(“website.com”,”user”,”password”,”database_name”);
// Check connection
if (mysqli_connect_errno())
{
echo “Failed to connect to MySQL: ” . mysqli_connect_error();
}
?>
… Read more How to select a database in PHP ?
mysql_select_db() is using to select a MySQL database.
mysql_select_db()
<?php
// Create connection
$link=mysqli_connect(“website.com”,”user”,”password”);
$link=mysqli_connect(“website.com”,”user”,”password”);
// Check connection
if (!$link) {
die(‘Not connected : ‘ . mysql_error());
}
// Select database
$db_selected = mysql_select_db(‘database_name’, $link);
if (!$db_selected) {
die (‘Not Selected database’ . mysql_error());
}
?>
… Read more What is PEAR in PHP ?
Short for PHP Extension and Application Repository, PEAR is a framework and distribution system for reusable PHP components. It is a structured library of open-source code for PHP users. It following a system for code distribution and package maintenance and a standard style for code written … Read more
How to find the position of the first occurrence of a substring in a string using PHP ?
strpos() helps to find the position of the first occurrence of a substring in a string.
strpos()
<?php
echo strpos(“Welcome to the php world”,”php”);
?>
Output : 15… Read more
What is sql injection ? Please explain it.
SQL injection is a code injection technique and it is using to attack data driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application’s software, for … Read more
How to delete a file from the system using PHP ?
unlink() is using tp delete the given file from the file system.
unlink()
<?php
$fh = fopen(‘page.html’, ‘a’);
fwrite($fh, ‘< h1>Hello world!‘);
fclose($fh);
unlink(‘page.html’);
?>
… Read more What is the use of the function htmlentities in PHP ?
It helps to convert all applicable characters to HTML entities.
htmlentities()
<?php
< ?php
$str = "A 'quote' is <b>bold</b>";
echo htmlentities($str);
// Outputs: A ‘quote’ is < ;b> ;bold< ;/b> ;
echo htmlentities($str, ENT_QUOTES);
// Outputs: A & #039 ;quote& #039 ; is < ;b> ;bold< ;/b> ; (ENT_QUOTES Will convert both double and single quotes.)
Is it possible to decrypt md5 hashes in PHP ?
MD5 is a hashing algorithm, you can not revert the hash value.… Read more
What is the difference between $var and $$var?
In PHP , both are variables. But $var is a variable with a fixed name. $$var is a variable who’s name is stored in $var. For example, if $var contains “user”, $$var is the same as $user.… Read more