Php: How to delete duplicate rows in a text file _ PHP Tutorial

Php deletes duplicate rows in a text file. Php: How to delete duplicate rows in a text file this article describes how to delete duplicate rows in a text file in php. I would like to share with you how to delete repeated rows in text files in php.

　Php deletes duplicate rows in a text file

This example describes how to delete duplicate rows in a text file in php. Share it with you for your reference. The specific analysis is as follows:

This php function is used to delete duplicate rows in the file. you can also specify whether to ignore the case sensitivity and specify the line break.

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/** * RemoveDuplicatedLines * This function removes all duplicated lines of the given text file. * * @ Param string * @ Param bool * @ Return string */ Function RemoveDuplicatedLines ($ Filepath, $ IgnoreCase = false, $ NewLine = "\ n "){ If (! File_exists ($ Filepath )){ $ ErrorMsg = 'removeduplicatedlines error :'; $ ErrorMsg. = 'the given file '. $ Filepath. 'does not exist! '; Die ($ ErrorMsg ); } $ Content = file_get_contents ($ Filepath ); $ Content = RemoveDuplicatedLinesByString ($ Content, $ IgnoreCase, $ NewLine ); // Is the file writeable? If (! Is_writeable ($ Filepath )){ $ ErrorMsg = 'removeduplicatedlines error :'; $ ErrorMsg. = 'the given file '. $ Filepath.' is not writeable! '; Die ($ ErrorMsg ); } // Write the new file $ FileResource = fopen ($ Filepath, 'W + '); Fwrite ($ FileResource, $ Content ); Fclose ($ FileResource ); } /** * RemoveDuplicatedLinesByString * This function removes all duplicated lines of the given string. * * @ Param string * @ Param bool * @ Return string */ Function RemoveDuplicatedLinesByString ($ Lines, $ IgnoreCase = false, $ NewLine = "\ n "){ If (is_array ($ Lines )) $ Lines = implode ($ NewLine, $ Lines ); $ Lines = explode ($ NewLine, $ Lines ); $ LineArray = array (); $ Duplicates = 0; // Go trough all lines of the given file For ($ Line = 0; $ Line <count ($ Lines); $ Line ++ ){ // Trim whitespace for the current line $ CurrentLine = trim ($ Lines [$ Line]); // Skip empty lines If ($ CurrentLine = '') Continue; // Use the line contents as array key $ LineKey = $ CurrentLine; If ($ IgnoreCase) $ LineKey = strtolower ($ LineKey ); // Check if the array key already exists, // If not add it otherwise increase the counter If (! Isset ($ LineArray [$ LineKey]) $ LineArray [$ LineKey] = $ CurrentLine; Else $ Duplicates ++; } // Sort the array Asort ($ LineArray ); // Return how many lines got removed Return implode ($ NewLine, array_values ($ LineArray )); }

Example:

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// Example 1 // Removes all duplicated lines of the file definied in the first parameter. $ RemovedLinesCount = RemoveDuplicatedLines('test.txt '); Print "Removed $ RemovedLinesCount duplicate lines from the test.txt file ."; // Example 2 (Ignore case) // Same as above, just ignores the line case. RemoveDuplicatedLines('test.txt ', true ); // Example 3 (Custom new line character) // By using the 3rd parameter you can define which character // Shocould be used as new line indicator. In this case // The example file looks like 'foo; bar; foo; foo' and will // Be replaced with 'Foo; bar' RemoveDuplicatedLines('test.txt ', false ,';');

I hope this article will help you with php programming.

Using php to delete duplicate rows in a text file this article describes how php deletes duplicate rows in a text file. Share it with you for your reference...