PHP mysqli: stmt_init() function
mysqli_stmt_init() function / mysqli::stmt_init
The mysqli_stmt_init() function / mysqli::stmt_init initializes a statement and returns an object suitable for mysqli_stmt_prepare().
Syntax:
Object oriented style
mysqli_stmt mysqli::stmt_init ( void )
Procedural style
mysqli_stmt mysqli_stmt_init ( mysqli $link )
Parameter:
Name | Description | Required/Optional | |
---|---|---|---|
link | A link identifier returned by mysqli_connect() or mysqli_init() | Required for procedural style only and Optional for Object oriented style |
Usage: Procedural style
mysqli_stmt_init(connection);
Parameter:
Name | Description | Required/Optional |
---|---|---|
connection | Specifies the MySQL connection to use | Required |
Return value:
Returns an object.
Version: PHP 5, PHP 7
Example:
<?php
$con=mysqli_connect("localhost","user1","datasoft123","hr");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$city="Paris";
// Create a prepared statement
$stmt=mysqli_stmt_init($con);
if (mysqli_stmt_prepare($stmt,"SELECT District FROM City WHERE Name=?"))
{
// Bind parameters
mysqli_stmt_bind_param($stmt,"s",$city);
// Execute query
mysqli_stmt_execute($stmt);
// Bind result variables
mysqli_stmt_bind_result($stmt,$district);
// Fetch value
mysqli_stmt_fetch($stmt);
printf("%s is in district %s",$city,$district);
// Close statement
mysqli_stmt_close($stmt);
}
mysqli_close($con);
?>
Sample Output:
System status: Uptime: 15909 Threads: 2 Questions: 112 Slow queries: 0 Opens: 16 Flush tables: 1 Open tables: 0 Queries per second avg: 0.7
See also
Previous: stat
Next: store_result
PHP: Tips of the Day
Getting all defined constants
To get all defined constants including those created by PHP use the get_defined_constants function:
Example:
<?php $constants = get_defined_constants(); var_dump($constants); // pretty large list
Output:
array(2250) { ["E_ERROR"]=> int(1) ["E_RECOVERABLE_ERROR"]=> int(4096) ["E_WARNING"]=> ..... ..... resource(1) of type (stream) ["STDOUT"]=> resource(2) of type (stream) ["STDERR"]=> resource(3) of type (stream) }
To get only those constants that were defined by your app call the function at the beginning and at the end of your script (normally after the bootstrap process):
<?php $constants = get_defined_constants(); define("HELLO", "hello"); define("WORLD", "world"); $new_constants = get_defined_constants(); $myconstants = array_diff_assoc($new_constants, $constants); var_export($myconstants);
Output:
array ( 'HELLO' => 'hello', 'WORLD' => 'world', )
It's sometimes useful for debugging
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