Principle:
1. The first user browses a certain page.
2. The server program reads the number of times the page has been viewed from the database or file.
3. Store the number plus one and send it back to the first user.
4. The second user browses a certain page.
5. The server program reads the number of times the page has been viewed from the database or file.
6. Save the number by one and send it back to the second user.
Functions you need to know:
fopen() opens a file
filesize() gets the file size
fseek() moves the file pointer
fgets() gets the content of the line where the file pointer is
fputs() writes the string as the position of the file pointer
fclose() closes the file
file_exists() determines whether the file exists
exec() executes an external program
The simplest counter:
Visitor Counter Prototype</title> ; <br></head> <br><body> <br><?php <br>/* <br>(c)1998 David W. Bettis <br>Here is the copyright information <br>*/ <br>$counterFile = "counter.txt"; <br>#here Define the counter file <br>function displayCounter($counterFile) { <br>$fp = fopen($counterFile,"rw"); <br>#Open the file in read and write mode <br>$num = fgets($fp,5); <br> #Get the current number <br>$num += 1; <br>#Add 1 <br>print "You are the "."$num"." boring person"; <br>exec( "rm -rf $counterFile"); <br>exec( " echo $num > $counterFile"); <br>#Lazy way, write without using fputs <br>} <br>if (!file_exists($counterFile)) { <br>exec( "echo 0 > $counterFile"); #If the counter file does not exist, create it and set the content to 0 <br>displayCounter($counterFile); <br>?> <br></body> <br></html> <br>PHP counter simpler version: <br>< ;? <br>#The copyright is gone, it’s that simple <br>$fp=fopen("counter.txt","r+"); <br>flock($fp,3); <br>#Open the counter file and lock it <br>$fsize= filesize("count.txt"); <br>$count=fgets($fp,$fsize+1); <br>$count++; <br>#Get the number and add one <br>fseek($fp,0); <br>fputs($fp, $count); <br>fclose($fp); <br>#Write new numbers to the file<br>echo "You are the $count visitor"; <br>?> <br>PHP counter graphic version: <br>Create 10 pictures, I won’t go into details about how to combine digital strings with pictures. Assume that the pictures are 0.gif ~ 9.gif. <br><? <br>....$count is the obtained value <br>$strcount=strval($count); <br>$strcount=chop($strcount); <br>$countlen=$strlen($strcount); <br>$shtml=""; <br>for ($i=0; $i<$countlen; $i++) { <br>$shtml. ="<img src='"; <br>$shtml.=$strcount[$i]; <br>$shtml.=".gif'>"; <br>} <br>echo $shtml; <br>?> <br>PHP count Server database version: <br>Use SQL counter, build the table first <br>CREATE TABLE counter <br>( <br>counter int not null, <br>id int not null <br>) <br>INSERT INTO counter(counter,id) VALUE( 0,1) <br><? <br>$c ..., ...); <br>#MySQL database connection <br>$sql="select * from counter"; <br>$result=mysql_query($sql,$conn); <br> $objresult=mysql_fetch_object($result); <br>$count=$objresult->counter; <br>$count++; <br>$sql="update counter set counter=".$count."where id=1"; <br>mysql_query($ sql,$conn); <br>mysql_close($conn); <br>echo "You are the $count visitor"; <br>?>
<br>
The above has introduced the counter. The simplest PHP program - the counter, including the counter content, I hope it will be helpful to friends who are interested in PHP tutorials. <br>
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<a href="https://www.php.cn/faq/1796795664.html" title="PHP and Python: Comparing Two Popular Programming Languages" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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<a href="https://www.php.cn/faq/1796795664.html" title="PHP and Python: Comparing Two Popular Programming Languages" class="phphistorical_Version2_mids_title">PHP and Python: Comparing Two Popular Programming Languages</a>
<span class="Articlelist_txts_time">Apr 14, 2025 am 12:13 AM</span>
<p class="Articlelist_txts_p">PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.</p>
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<a href="https://www.php.cn/faq/1796795680.html" title="PHP in Action: Real-World Examples and Applications" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174456117044038.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="PHP in Action: Real-World Examples and Applications" />
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<a href="https://www.php.cn/faq/1796795680.html" title="PHP in Action: Real-World Examples and Applications" class="phphistorical_Version2_mids_title">PHP in Action: Real-World Examples and Applications</a>
<span class="Articlelist_txts_time">Apr 14, 2025 am 12:19 AM</span>
<p class="Articlelist_txts_p">PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.</p>
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<a href="https://www.php.cn/faq/1796797284.html" title="Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174481961034298.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?" />
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<a href="https://www.php.cn/faq/1796797284.html" title="Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?" class="phphistorical_Version2_mids_title">Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?</a>
<span class="Articlelist_txts_time">Apr 17, 2025 am 12:06 AM</span>
<p class="Articlelist_txts_p">In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.</p>
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<a href="https://www.php.cn/faq/1796795196.html" title="PHP: A Key Language for Web Development" class="phphistorical_Version2_mids_img">
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<a href="https://www.php.cn/faq/1796795196.html" title="PHP: A Key Language for Web Development" class="phphistorical_Version2_mids_title">PHP: A Key Language for Web Development</a>
<span class="Articlelist_txts_time">Apr 13, 2025 am 12:08 AM</span>
<p class="Articlelist_txts_p">PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7</p>
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<a href="https://www.php.cn/faq/1796793664.html" title="How does PHP handle file uploads securely?" class="phphistorical_Version2_mids_img">
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src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174424905288916.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How does PHP handle file uploads securely?" />
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<a href="https://www.php.cn/faq/1796793664.html" title="How does PHP handle file uploads securely?" class="phphistorical_Version2_mids_title">How does PHP handle file uploads securely?</a>
<span class="Articlelist_txts_time">Apr 10, 2025 am 09:37 AM</span>
<p class="Articlelist_txts_p">PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.</p>
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<a href="https://www.php.cn/faq/1796797342.html" title="How does PHP type hinting work, including scalar types, return types, union types, and nullable types?" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174482073083070.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How does PHP type hinting work, including scalar types, return types, union types, and nullable types?" />
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<a href="https://www.php.cn/faq/1796797342.html" title="How does PHP type hinting work, including scalar types, return types, union types, and nullable types?" class="phphistorical_Version2_mids_title">How does PHP type hinting work, including scalar types, return types, union types, and nullable types?</a>
<span class="Articlelist_txts_time">Apr 17, 2025 am 12:25 AM</span>
<p class="Articlelist_txts_p">PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.</p>
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<a href="https://www.php.cn/faq/1796795660.html" title="The Enduring Relevance of PHP: Is It Still Alive?" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174456074010125.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="The Enduring Relevance of PHP: Is It Still Alive?" />
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<a href="https://www.php.cn/faq/1796795660.html" title="The Enduring Relevance of PHP: Is It Still Alive?" class="phphistorical_Version2_mids_title">The Enduring Relevance of PHP: Is It Still Alive?</a>
<span class="Articlelist_txts_time">Apr 14, 2025 am 12:12 AM</span>
<p class="Articlelist_txts_p">PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.</p>
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<a href="https://www.php.cn/faq/1796794185.html" title="PHP vs. Python: Understanding the Differences" class="phphistorical_Version2_mids_img">
<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/174430171112514.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="PHP vs. Python: Understanding the Differences" />
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<a href="https://www.php.cn/faq/1796794185.html" title="PHP vs. Python: Understanding the Differences" class="phphistorical_Version2_mids_title">PHP vs. Python: Understanding the Differences</a>
<span class="Articlelist_txts_time">Apr 11, 2025 am 12:15 AM</span>
<p class="Articlelist_txts_p">PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.</p>
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