PHP マニュアル
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# mysqli_connect_errno

(PHP 5)

mysqli_connect_errno -- Returns the error code from last connect call

## Description

int mysqli_connect_errno ( void )

The mysqli_connect_errno() function will return the last error code number for last call to mysqli_connect(). If no errors have occured, this function will return zero.

> 注意: Client error message numbers are listed in the MySQL `errmsg.h` header file, server error message numbers are listed in `mysqld_error.h`. In the MySQL source distribution you can find a complete list of error messages and error numbers in the file `Docs/mysqld_error.txt`.

## Return values

An error code value for the last call to mysqli_connect(), if it failed. zero means no error occurred.

## See also

mysqli_connect(), mysqli_connect_error(), mysqli_errno(), mysqli_error(), mysqli_sqlstate()

## Example

例 1. mysqli_connect_errno sample

`<?php $link = @mysqli_connect("localhost", "nonexisting_user", ""); if (!$link) { printf("Can't connect to localhost. Errorcode: %d\n", mysqli_connect_errno()); } ?>`

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