Advanced PHP Cheat Sheet

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A cheat sheet containing Advanced Operators, Database MySQL, File Reading / Writing, File / Directory Handling, Function Handling, Object Functions, Constants and Magic Constants. Advanced Operators Instanceof - <variable> instanceof <class> @ - @<function>() // Suppress generated errors/notices Database MySQL mysql_connect([<server>],[<user>],[<password>]); mysql_create_db(<database>,[<link_identifier>]); mysql_select_db(<database>,[<link_identifier>]); mysql_drop_db(<database>,[<link_identifier>]); mysql_list_dbs([<link_identifier>]); mysql_list_tables(<database>,[<link_identifier>]); mysql_list_fields(<database>,<table>,[<link_identifier>]); mysql_query(<query>,[<link_identifier>]); mysql_fetch_array(<query_result>,<result_type>); mysql_fetch_assoc(<query_result>); mysql_fetch_object(<query_result>,[<classname>],[<array params>]); mysql_fetch_row(<query_result>); // Example using fetch_array while ($result_row = mysql_fetch_array($result,MYSQL_ASSOC)) { echo "Field 1 is: {$result_row['field1']}"; } // Example using fetch_object while ($result_obj = mysql_fetch_object($result)) { echo "Field 1 is: " . $result_obj->field1; } mysql_affected_rows([<link_identifier>]); mysql_num_rows(<query_result>); mysql_num_fields(<query_result>); mysql_real_escape_string(<string>,[<link_identifier>]); mysql_close([<link_identifier>]); File Reading / Writing fopen(<filename>,<mode>,[<bool use_include_path>],[<context>]); fread(<file_handle>,<length>); fwrite(<file_handle>,<string>,[<length>]); fseek(<file_handle>,<offset>,[<whence>]); fclose(<file_handle>); is_readable(<filename>); is_writeable(<filename>); // Example of writing to file $file = fopen("hello.txt","w"); if ($file) { fwrite($file,"This is a line of text"); fclose($file); } // Example of reading from file $fileread = fopen("hello.txt","r"); if ($fileread) { $text = fread($fileread,100); fclose($fileread); echo "Read in: $text"; } File/directory Handling file_exists(<filename>); is_file(<filename>); dirname(<path>); is_dir(<filename>); mkdir(<pathname>,[<mode>],[<recursive>],[<context>]); rmdir(<dirname>,[<context>]); rename(<string oldname>,<string newname>,[<context>]); copy(<string source>,<string destination>,[<context>]); chmod(<filename>,<mode>); unlink(<filename,[<context>]); // Example of using is_file, copy, and unlink to rename file. if (is_file("hello.txt")) { copy("hello.txt","goodbye.txt"); unlink("hello.txt"); } // Example of file_exists and rename if (file_exists("goodbye.txt")) { rename("goodbye.txt","helloagain.txt"); } Function Handling create_function(<string args>,<string code>); call_user_func(<function_name> [,<parameter> [, <parameter> [, ... ]]]); call_user_func(array(<class_name>,<method_name>)[,<parameter> [, <parameter> [, ... ]]]); call_user_func_array(<functionname>,<array of parameters>); function_exists(<functionname>); // Example of creating anonymous function (returns the value 6) $myNewFunction = create_function('$param1,$param2','return $param1 * $param2;'); echo "Result is: " . $myNewFunction(2,3); // Example of calling class method using parameter class MyClass { function showMessage($test = "") { echo "Welcome to DIC! $test"; } } call_user_func(array('MyClass','showMessage'),"Enjoy your stay."); Object Functions $variable = get_class([<object>]); $arrayofclassnames = get_declared_classes(); $variable = get_parent_class([<object>]); $arrayofproperties = get_object_vars([<object>]); is_a(<object>,<classname>); is_subclass_of(<object>,<classname>); class_exists(<classname>); method_exists(<object>,<methodname>); Constants // Define a constant define(<name>,<value>,[<case_sensitivity>]); Magic Constants __LINE__ - Current line number of the file. __FILE__ - The full path and filename of the file. If used inside an include, the name of the included file is returned. __FUNCTION__ - The function name. __CLASS__ - The class name. __METHOD__ - The class method name. (PHP 5.0+) Comments Search Only registered users can write comments!

Last Updated ( Sunday, 22 June 2008 )

 

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