PHP Remove duplicate rows in a text file _php tips

The example in this article describes how PHP deletes duplicate rows in a text file. Share to everyone for your reference. The specific analysis is as follows:

This PHP function is used to delete duplicate rows in a file, to specify whether to ignore case, and to specify line breaks

/** * 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 ();
  $Duplicates = 0; Go trough all lines to the given file for ($Line =0; $Line < count ($Lines); $Line + +) {//Trim whitespace for th
    E 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 ($LineArray [$L    
    Inekey]) $LineArray [$LineKey] = $CurrentLine;
  else $Duplicates + +;
  }//Sort the array asort ($LineArray); Return to many lines got removed return implode ($NewLine, Array_values ($LineArray)); }

Use Example:

Example 1
//Removes all duplicated lines of the "file Definied in the"
$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 can define which character
//should be Used as new line indicator. In this case
//The example file looks like ' Foo;bar;foo;foo ' and would
/is replaced with ' Foo;bar ' 
Remove Duplicatedlines (' Test.txt ', false, '; ');

I hope this article will help you with your PHP program design.