PHP Read Specific Line From File

Question

I m trying to read a specific line from a text file using php  Here s the text file     foo   foo2   How would I get the content of the second line using php  This returns the first line    lt  php   myFile    4-24-11 txt    fh   fopen  myFile   r     theData   fgets  fh   fclose  fh   echo  theData    gt      but I need the second     Any help would be greatly appreciated

User · Answer

You have to loop the file till end of file       while  feof  file            echo fgets  file     lt br   gt          fclose  file

User · Answer

If you wanted to do it that way      line   0   while    buffer   fgets  fh       FALSE       if   line    1              This is the second line         break              line        Alternatively  open it with file   and subscript the line with  1

User · Answer

omg I m lacking 7 rep to make comments  This is   Raptor s  amp   Tomm s comment  since this question still shows up way high in google serps   He s exactly right  For small files file  file   is perfectly fine  For large files it s total overkill b c php arrays eat memory like crazy   I just ran a tiny test with a   csv with a file size of  67mb  1 000 000 lines     t   -microtime 1    file       data 1000k csv    lines   file  file   echo  lines 999999         n   memory get peak usage 1  1024 1024         n    t microtime 1      227 5   0 22701287269592   Process finished with exit code 0   And since noone mentioned it yet  I gave the SplFileObject a try  which I actually just recently discovered for myself    t   -microtime 1    file       data 1000k csv    spl   new SplFileObject  file    spl- gt seek 999999   echo  spl- gt current          n   memory get peak usage 1  1024 1024         n    t microtime 1      0 5   0 11500692367554   Process finished with exit code 0   This was on my Win7 desktop so it s not representative for production environment  but still     quite the difference

User · Answer

If you use PHP on Linux  you may try the following to read text for example between 74th and 159th lines    text   shell exec  sed -n  74 159p  path to file log      This solution is good if your file is large

User · Answer

myFile    4-21-11 txt    fh   fopen  myFile   r    while  feof  fh          data     fgets  fh           Do whatever you want with the data in here       This feeds the file into an array line by line   fclose  fh

User · Answer

I searched for a one line solution to read specific line from a file  Here my solution  echo file  dayInt txt   1

User · Answer

You could try looping until the line you want  not the EOF  and resetting the variable to the line each time  not adding to it   In your case  the 2nd line is the EOF   A for loop is probably more appropriate in my code below    This way the entire file is not in the memory  the drawback is it takes time to go through the file up to the point you want    lt  php   myFile    4-24-11 txt    fh   fopen  myFile   r     i   0  while   i  lt  2        theData   fgets  fh      i      fclose  fh   echo  theData    gt

User · Answer

you can use the following to get all the lines in the file   handle    fopen  test txt    r     if   handle        while   feof  handle              lines     fgets  handle  4096             fclose  handle         print r  lines     and  lines 1  for your second line

User · Answer

I would use the SplFileObject class      file   new SplFileObject  filename    if    file- gt eof            file- gt seek  lineNumber         contents    file- gt current        contents would hold the data from line x

User · Answer

Use stream get line  stream get line     Gets line from stream resource up to a given delimiter Source  http   php net manual en function stream-get-line php

User · Answer

I like daggett answer but there is another solution you can get try if your file is not big enough    file     FILE       Let s take the current file just as an example    start line     LINE   -1     The same with the line what we look for  Take the line number where  line variable is declared as the start    lines to display   5     The number of lines to display  Displays only the  start line if set to 1  If  lines to display argument is omitted displays all lines starting from the  start line   echo implode     array slice file  file    start line  lines to display

User · Answer

This question is quite old by now  but for anyone dealing with very large files  here is a solution that does not involve reading every preceding line  This was also the only solution that worked in my case for a file with  160 million lines    lt  php function rand line  fileName        do           fileSize filesize  fileName            fp   fopen  fileName   r            fseek  fp  rand 0   fileSize             data   fread  fp  4096       assumes lines are  lt  4096 characters         fclose  fp            a   explode   n   data        while count  a  lt 2       return  a 1      echo rand line  file txt        change file name   gt    It works by opening the file without reading anything  then moving the pointer instantly to a random position  reading up to 4096 characters from that point  then grabbing the first complete line from that data

User · Answer

myFile    4-24-11 txt    lines   file  myFile    file in to an array echo  lines 1     line 2   file     Reads entire file into an array

[php] PHP: Read Specific Line From File

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