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PHP mysqli: connect_error() function

mysqli_connect_error() function / mysqli::$connect_error

The mysqli_connect_error() function / mysqli::$connect_error returns the error description from the last connection error, if any.

Syntax:

Object oriented style

string $mysqli->connect_error;

Procedural style

string mysqli_connect_error ( void )

Usage: Procedural style

mysqli_connect_error();

Return value:

A string that describes the error. NULL is returned if no error occurred.

Version: PHP 5, PHP 7

Example of object oriented style:

<?php
$mysqli = @new mysqli('localhost', 'user1', 'datasoft123', 'hr');

// Works as of PHP 5.2.9 and 5.3.0.
if ($mysqli->connect_error) {
    die('Connect Error: ' . $mysqli->connect_error);
}
?>

Example of procedural style:

<?php
$link = @mysqli_connect('localhost', 'user1', 'datasoft123', 'hr');

if (!$link) {
    die('Connect Error: ' . mysqli_connect_errno());
}
?>

Example:

<?php
$con=mysqli_connect("localhost","user1","datasoft123","hr");
// Check connection
if (!$con)
  {
  die("Connection error: " . mysqli_connect_errno());
  }
?>

Output:

Connection error: 0

See also

PHP Function Reference

Previous: connect_errno
Next: connect



PHP: Tips of the Day

var_export(): var_export() dumps a PHP parseable representation of the item.

You can pass true as the second parameter to return the contents into a variable.

Example:

<?php
$myarray = [ "PHP", "Tips" ];
$mystring = "PHP Tips";
$myint = 28;

var_export($myarray);
var_export($mystring);
var_export($myint);
?>

Output:

array (
  0 => 'PHP',
  1 => 'Tips',
)'PHP Tips'28

To put the content into a variable, you can do this:

$array_export = var_export($myarray, true);
$string_export = var_export($mystring, true);
$int_export = var_export($myint, 1); // any `Truthy` value

After that, you can output it like this:

printf('$myarray = %s; %s', $array_export, PHP_EOL);
printf('$mystring = %s; %s', $string_export, PHP_EOL);
printf('$myint = %s; %s', $int_export, PHP_EOL);

Example:

<?php
$myarray = [ "PHP", "Tips" ];
$mystring = "PHP Tips";
$myint = 28;
$array_export = var_export($myarray, true);
$string_export = var_export($mystring, true);
$int_export = var_export($myint, 1);
printf('$myarray = %s; %s', $array_export, PHP_EOL);
printf('$mystring = %s; %s', $string_export, PHP_EOL);
printf('$myint = %s; %s', $int_export, PHP_EOL);
?>

This will produce the following output:

Output:

$myarray = array (
  0 => 'PHP',
  1 => 'Tips',
);
$mystring = 'PHP Tips';
$myint = 28;