mysql_error() Function in PHP

What is mysql_error() function in PHP?
How does mysql_error() works?


mysql_error() function returns the text error message from previous MySQL operation.
string mysql_error ( [resource link_identifier])

Returns the error text from the last MySQL function, or '' (the empty string) if no error occurred.
mysql_error() function is used to retrieve the error text from the most recently executed MySQL function

//Attempt to connect to the default database server
$link = mysql_connect("mysql_host", "mysql_user", "mysql_password")
or die ("Could not connect");
//select non existing database
if (!mysql_select_db("my_database", $link)) {
//prints error message on selecting non existing database
echo mysql_errno($link) . ": " . mysql_error($link). "n";
//Attempt to select database
mysql_select_db("my_database", $link);
//Execute query
if (!mysql_query("SELECT * FROM nonexistenttable", $link)) {
//Display error report
echo mysql_errno($link) . ": " . mysql_error($link). "n";

In the above example, the query fails due to non existance of database 'my_database' and table 'nonexistenttable'. Here 'mysql_errno' function prints the occured error number and 'mysql_error' prints the text error message from the executed query.
1049: Unknown database 'nonexistentdb'
1146: Table 'my_database.nonexistenttable' doesn't exist
See also: mysql_errno() and MySQL error messages

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