A brief analysis of how to read large files in limited memory in PHP_PHP Tutorial

Under normal circumstances, we can use fseek to read. The advantage is that it will not be read all at once. The following code is only suitable for fetching and processing at the same time, and is not suitable for one-time reading and one-time processing.
You can use the following method to generate test files

Copy the code The code is as follows:

$file_handle = fopen("./csdn.txt", "rb+");
for ($index1 = 1; $index1 <= 2000000; $index1++) {
fwrite($file_handle , 'http://jb51.net'.$index1."r");
}
fclose($file_handle);

The reading processing code is as follows:

Copy code The code is as follows:

$i = 0;
$now = '';
while ($i >= 0) {
if ($i>10) {
break;
}
fseek($file_handle, 0, SEEK_CUR);
$now = fgetc($file_handle);//You can write your own judgment false to indicate the end of the file
if ($now == "r") {
                                                          using             using   use using   using using   using using            use using ’’s ’ use to ‐ return to end‐‐‐‐‐‐ if ($now == "r") {
                                                                                                                 $now;
$i++;
}
fclose($file_handle);

http://www.bkjia.com/PHPjc/328032.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/328032.htmlTechArticleUnder normal circumstances, we can use fseek to read. The advantage is that it will not be read all at once. The following code only It is suitable for processing while taking, but not suitable for one-time reading and one-time processing. Can...