Common Errors in PHP

1. notice:undefined variable: variable name in note: Use a variable that is not defined 2, Parse error:syntax error, unexpected t_else in if () {}else if ( ) {} Echo $test; else {} Note: is if else if else syntax error 3, parse Error:syntax error, unexpected $end in D Note: Usually curly braces do not match 4, parse Error:syntax error , unexpected t_string in note: Generally forget to write a semicolon 5, warning:invalid argument supplied for foreach () in note: The first parameter of foreach must be an array of 6, Warnin G:MYSQL_FETCH_ASSOC (): supplied argument is not a valid MySQL results resource in Note: This indicates that the previous execution of the SQL return failure, typically SQL statement error, such as analysis does not come out , just can print out mysql_error (); See where it's wrong. 7, no database selected note: There is generally no connection to databases 8, Warning:mysql_connect () [Function.mysql-connect]: Access denied for   User ' root ' @ ' localhost ' (using Password:yes) in ..... On lines 3 Access denied for user ' root ' @ ' localhost ' (using password:yes) Note: Database username password wrong 9, Unknown ' cms07261′ Note: no this number  According to library 10, table ' cms0726.test ' doesn ' t exist Note: Table does not exist 11, Unknown column ' abc ' in ' Field List ' Note: field does not exist 12, column count doesn ' t match Value count at row 1 Note: The number of field values in the SQL statement is different than the number of field names 13, WarnIng:wrong parameter count for function name in NOTE: function is 14 less than number of numbers, Fatal error:smarty error: [In message_list.html lines]: Syntax err Or: ' Foreach:item ' must be a variable name (literal string) Note: Look at the line number, stating that the item after the foreach must be followed by a variable name, without $, is a string (note: No single-double-cited) 15, Fa Tal error:smarty Error: [In message_list.html line]: syntax error:unrecognized tag:msg.message_id NOTE: The variables in the template are missing $16, Wa Rning:smarty error:unable to read resource: ' message_list1.html ' in note: The template file could not be found to see if the file name was incorrectly written or stored in a different directory.  17, Fatal Error:cannot redeclare get_sort1 () (previously declared in note: function has already been defined, can not be redefined I hope this article is helpful to PHP program design.

　　

Common Errors in PHP