PHP is not connected to MySQL but MySQL command-line operation is normal solution _mysql

Failure Status: PHP Web Connection MySQL failed, but at the command line through the MySQL command to log in and normal operation.
Solution:
1, under the command line login MySQL, execute the following command:

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Show variables like ' socket ';

After execution, it will be similar to the following echo:

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"Variable_name" "Value"
"Socket" "/home/mysql/data/mysql.sock"

2, edit php.ini, find mysql.default_socket configuration items, the default is generally null value (use edit MySQL set sock path), add this value to the above echo in the "/home/mysql/data/mysql.sock":

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;  Default socket name for the local MySQL connects. If empty, uses the built-in
; MySQL defaults.
Mysql.default_socket =/home/mysql/data/mysql.sock

3, restart PHP.