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In case you were wondering, the options passed to fopen() in the previous listing are used to open the file in read-only mode ("r") and binary mode ("b") If you re trying to read a file over a network link, it may not always be a good idea to slurp up a file in a single chunk due to network bandwidth considerations In such situations, the recommended way to read a file is in chunks with the
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PHP Programming Solutions fgets() function, and then combine the chunks to create a complete string Here s an illustration:
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< php // open file $fp = fopen("/mnt/net/machine2/hda1/dummytxt", "rb") or die ("Cannot open file"); // read contents into a string while (!feof($fp)) { $dataStr = fgets($fp, 1024); } // close file fclose($fp) or die ("Cannot close file"); // display contents echo $dataStr; >
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Read the file into an array with PHP s file() function, and then extract the required lines:
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< php // read file into array $data = file('fortunestxt') or die("Cannot read file"); // get first line echo $data[0] "\n"; // get last line echo end($data) "\n";
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6: Working with Files and Directories
// get line 5 echo $data[4] "\n"; // get lines 2-6 $lines = array_slice($data, 1, 5); echo implode("\n", $lines); >
Write a custom function that uses the fgets() and fseek() calls to pick one or more lines out of a file:
< php // function to get an arbitrary range of lines // from a file function getLines($file, $startLineNum, $endLineNum) { // check for valid range endpoints if ($endLineNum < $startLineNum) { die("Ending line number must be greater than or equal to starting line number!"); } // initialize line counter $lineCounter = 0; // open the file for reading $fp = fopen($file, "rb") or die("Cannot open file"); // read contents line by line while (!feof($fp) && $lineCounter <= $endLineNum) { // once the starting line number is attained // save contents to an array // until the ending line number is attained $lineCounter++; $line = fgets($fp); if ($lineCounter >= $startLineNum && $lineCounter <= $endLineNum) { $lineData[] = $line; } } // close the file fclose($fp) or die ("Cannot close file");
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// return line range to caller return $lineData; } // return lines 2-6 of file as array $lines = getLines("fortunestxt", 2, 6); print_r($lines); >
Comments
Extracting one or more lines from a file is one of the more common problems developers face, and it s no surprise that there are so many creative solutions to it The first listing outlines the simplest approach, storing the lines of a file in an array with PHP s file() function and then using array indexing to extract specific lines by number The second listing offers a more complicated approach, wherein a custom getLines() function accepts three arguments: a file path, a starting line number, and an ending line number (for a single line, the latter two will be equal) It then iterates through the named file, incrementing a counter as each line is processed Lines that fall within the supplied range will be saved to an array, which is returned to the caller once the entire file is processed You can also get the first and last lines of a file with a combination of fseek() and fgets() function calls, as illustrated here:
< php // open file $fp = fopen('fortunestxt', "rb") or die("Cannot open file"); // get first line fseek($fp, 0, SEEK_SET); echo fgets($fp); // get last line fseek($fp, 0, SEEK_SET); while (!feof($fp)) { $line = fgets($fp); } echo $line; // close file fclose($fp) or die ("Cannot close file"); >
6: Working with Files and Directories
Here, the fseek() function moves the internal file pointer to a specific location in the file, and the fgets() function retrieves all the data beginning from the pointer location until the next newline character To obtain the first line, set the file pointer to position 0 and call fgets() once; to obtain the last line, keep calling fgets() until the end of the file is reached and the last return value will represent the last line You should also take a look at the listing in 65: Reading Byte Ranges from a File for a variant that extracts file contents by bytes instead of lines
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