PHP 默認並不支持多線程，要使用多線程需要安裝 pthread 擴展，而要安裝 pthread 擴展，必須使用 --enable-maintainer-zts 參數重新編譯 PHP，這個參數是指定編譯 PHP 時使用線程安全方式。
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<?php
if(function_exists('date_default_timezone_set')) {
date_default_timezone_set('PRC');
}
function a() {
$time = time(); sleep(3);
$fp = fopen('result_a'.$time.'.log', 'w');
fputs($fp, 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn");
fclose($fp);
}
function b() {
$time = time();
sleep(3);
$fp = fopen('result_b'.$time.'.log', 'w');
fputs($fp, 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn");
fclose($fp);
}
if(!isset($_GET['act'])) $_GET['act'] = 'a';
if($_GET['act'] == 'a') {
a();
}
else if($_GET['act'] == 'b') b();
?>
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以上代碼，在本地寫入一個文件。
PHP多線程讀寫文件：
如果你訪問 localhost/a.php 在兩個瀏覽器標簽盡可能快的同時打開，發現兩個文件創建時間相差為3秒
但是如果你訪問localhost/a.php?act=b 另一個訪問/a.php?act=a 你發現兩個文件創建的時間幾乎差不多。
對於apache來說同樣的url意味着一個線程（我們或者說是進程），但是不同的URL意味着可以 並發 。
如果php內部有下載的動作
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function runThread() {
down("http://localhost/test/a.php?act=a");
}
if($_GET['act'] == 'run') {
echo 'start:';
runThread();
echo ' End';
}
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http://localhost/test/a.php?act=run
http://localhost/test/a.php?act=run&s=2
只要主訪問的url不同，則認為是不同的進行，意味着並發。文件創建時間不為3秒
本地有Linux服務器的朋友也可以借助linux來進行模擬並發
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<?php for ($i=0;$i<10;$i++) { echo $i; sleep(5); } ?>
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上面存成test.php, 然后寫一段SHELL代碼
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#!/bin/bash
for i in 1 2 3 4 5 6 7 8 9 10
do
php -q test.php &
done
Fixed a bug where :doc:`Image Manipulation Library <libraries/image_lib>` didn't escape image source paths passed to ImageMagick as shell arguments.
Fixed a bug (#861) - :doc:`Database Forge <database/forge>` method create_table() incorrectly accepts field width constraints for mssql/SQLSRV integer-type columns.
Fixed a bug (#4562) - :doc:`Cache Library <libraries/caching>` didn't check if Memcached::quit() is available before calling it.
Fixed a bug (#4563) - :doc:`Input Library <libraries/input>` method request_headers() ignores $xss_clean parameter value after first call.
Fixed a bug (#4605) - :doc:`Config Library <libraries/config>` method site_url() stripped trailing slashes from relative URIs passed to it.
Fixed a bug (#4613) - :doc:`Email Library <libraries/config>` failed to send multiple emails via SMTP due to "already authenticated" errors when keep-alive is enabled.
Fixed a bug (#4633) - :doc:`Form Validation Library <libraries/form_validation>` ignored multiple "callback" rules for empty, non-required fields.
Fixed a bug (#4637) - :doc:`Database <database/index>` method error() returned FALSE with the 'oci8' driver if there was no error.
Fixed a bug (#4647) - :doc:`Query Builder <database/query_builder>` method count_all_results() doesn't take into account GROUP BY clauses while deciding whether to do a subquery or not.
Fixed a bug where
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