(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_last_error — Get the last error message string of a connection
pg_last_error ([ resource $connection ] ) : string
pg_last_error() returns the last error message for a given connection.
Error messages may be overwritten by internal PostgreSQL (libpq) function calls. It may not return an appropriate error message if multiple errors occur inside a PostgreSQL module function.
Use pg_result_error(), pg_result_error_field(), pg_result_status() and pg_connection_status() for better error handling.
Note:
This function used to be called pg_errormessage().
connection
PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
A string containing the last error message on the given connection, or false on error.
Example #1 pg_last_error() example
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
// Query that fails
$res = pg_query($dbconn, "select * from doesnotexist");
echo pg_last_error($dbconn);
?>
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https://www.php.net/manual/en/function.pg-last-error.php