PHP:404错误陷阱并email给管理员的程序_PHP教程
# 404.php, 8/10/2000.
# Traps 404 errors and mails a notice to the webmaster.
# Requires PHP 3.0 or newer, and mail capability on your system.
#
# Copyright 2000 shaun@shat.net under the GNU Public License.
# Disclaimer: I wrote this script for me, and it works for me.
# If it doesnt work for you, or makes your server explode,
# thats life. Please email with questions or bug reports.
# Set these variables to configure the script:
# Set $domain to your domain name (no www)
$domain = "your.domain.com";
# Set $docroot to the URL of the directory which contains your
# .htaccess file. Dont include trailing slash.
$docroot = "http://your.domain.com";
# Font face youd like to use on the 404 page
$fontface = "Verdana";
# Font size youd like to use on the 404 page
$fontsize = "2";
# Background color of the 404 page (default is white)
$bgcolor = "#ffffff";
# Text color youd like to use on the 404 page (default is black)
$textcolor = "#000000";
# This script is capable of mailing the details of each 404 error
# to the webmaster. Use the $reportlevel variable to control when
# you receive these reports.
#
# 0 = dont use the email capabilities at all
# 1 = send email only if the errors referer contains your domain name
# (i.e. the 404 was generated by a broken link on your site)
# 2 = send email any time a 404 error is generated (useful for tracking
# broken links at other sites which link to you)
$reportlevel = 2;
# Set $emailaddress to the email address of whoever should be
# notified of 404 errors. Dont escape the @ symbol. This will also
# be used as the "from" address on any emails the script generates.
# You can leave this unassigned if youre not using email features.
$emailaddress = "you@your.domain.com";
################################################################
# DONT EDIT BELOW THIS LINE UNLESS YOU KNOW WHAT YOURE DOING #
################################################################
# If you want to edit the script, Ive commented profusely :) #
################################################################
# The print_details function is what prints the 404 error to
# the visitor. As far as I know, PHP3 doesnt incorporate Perls
# print # but the script was written for PHP3. So, you have to use
# a lot of echo statements if you want to retain PHP3 compat.
function print_details()
{
# Request access to the global variables we need
global $fontface, $fontsize, $docroot, $REQUEST_URI, $reportlevel;
global $bgcolor, $textcolor
# Print the 404 error in web format
echo "
echo "";
echo "
404 Not Found
";echo "
";
echo "Were sorry. The page you requested, $docroot$REQUEST_URI, doesnt exist";
echo " on this server.
# If an email report is being generated, let the visitor know:
if ($reportlevel != 0)
{
echo "
";
echo "The details of this error have automatically been mailed to the webmaster.";
}
# Close up the HTML tags
# echo "";
return;
}
# The send_email function sends the details of the 404 error to the
# webmaster.
function send_email()
{
# Request access to the global variables we need
global $REQUEST_URI, $HTTP_REFERER, $emailaddress, $REMOTE_ADDR, $docroot;
# Build the $errortime variable to contain the date/time of the error.
# Using date() likely would have been better, but I already had this code
# elsewhere, and Im lazy.
$today = getdate();
$month = $today[mon];
$mday = $today[mday];
$year = $today[year];
$hours = $today[hours];
$minutes = $today[minutes];
$errortime = "$month/$mday/$year at $hours:$minutes";
# Create the body of the email message
$message .= "404 Error Report
A 404 error was encountered by $REMOTE_ADDR";
$message .= " on $errortime.
";
$message .= "The URI which generated the error is:
$docroot$REQUEST_URI
";
$message .= "The referring page was:
$HTTP_REFERER
";
# Send the mail message. This assumes mail() will work on your system!
mail("$emailaddress", "404 Error Report", $message, "From: $emailaddress");
return;
}
# Done with function declarations. Main function begins here.
# Send a 404 error to the users browser
print_details();
# See whether or not we should send an email report. If so, do it.
if ($reportlevel != 0)
if ($reportlevel == 1) {
if (eregi($domain,$HTTP_REFERER))
send_email(); }
else
send_email();
# All done!
exit;
?>

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Anda harus mengambil berat tentang kebergantungan (DI) kerana ia menjadikan kod anda lebih jelas dan lebih mudah untuk dikekalkan. 1) Di menjadikannya lebih modular dengan decoupling kelas, 2) meningkatkan kemudahan ujian dan fleksibiliti kod, 3) menggunakan bekas DI untuk menguruskan kebergantungan kompleks, tetapi memberi perhatian kepada kesan prestasi dan kebergantungan bulat, 4) Amalan terbaik adalah bergantung kepada antara muka abstrak untuk mencapai gandingan longgar.

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ThekeystrategiestoSignificLantantlyboostphpapplicationperformanceare: 1) useopcodecachinglikLikeopcachetoreduceExecutionTime, 2) OptimizedataBaseInteractionsWithPreparedStatementsandProperindexing, 3) ConfigureWebserverserverLikenginxWithPmforbetterShipter.

AphpdependencyInjectionContainerisatoLthatMatagesClassDependencies, EnhancingCodeModularity, Testability, andMaintainability.itactsascentralHubforcreatingandinjectingdependencies, sheReducingTightCouplingandeaseaseaseSunittesting.

Pilih DependencyInjection (DI) Untuk aplikasi besar, servicelocator sesuai untuk projek kecil atau prototaip. 1) DI meningkatkan kesesuaian dan modulariti kod melalui suntikan pembina. 2) ServiceLocator memperoleh perkhidmatan melalui pendaftaran pusat, yang mudah tetapi boleh menyebabkan peningkatan gandingan kod.

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PhpeMailvalidationInvolvestHreesteps: 1) formatValidationingRegularExpressionStocheckTheemailFormat; 2) dnsvalidationtoensurethedomainhasavalidmxrecord;


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