PHP mysqli: connect_errno() function
mysqli_connect_errno() function / mysqli::$connect_errno
The mysqli_connect_errno() function / mysqli::$connect_errno returns the error code from the last connection error, if any.
Syntax:
Object oriented style
int $mysqli->connect_errno;
Procedural style
int mysqli_connect_errno ( void )
Usage: Procedural style
mysqli_commit(connection);
Return value:
An error code value for the last call to mysqli_connect(), if it failed. zero means no error occurred.
Version: PHP 5, PHP 7
Example of object oriented style:
<?php
$mysqli = @new mysqli('localhost', 'user1', 'datasoft123', 'hr');
if ($mysqli->connect_errno) {
die('Connect Error: ' . $mysqli->connect_errno);
}
?>
Example of procedural style:
<?php
$link = @mysqli_connect('localhost', 'user1', 'datasoft123', 'hr');
if (!$link) {
die('Connect Error: ' . mysqli_connect_errno());
}
?>
Output:
Connect Error: 1045
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
Previous: commit
Next: connect_error
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;
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