Backend Development
PHP Tutorial
Use the strpos function in PHP to implement the function of blocking sensitive keywords, strpos keyword_PHP tutorial
Use the strpos function in PHP to implement the function of blocking sensitive keywords, strpos keyword_PHP tutorial
The strpos function is used in PHP to implement the function of blocking sensitive keywords. The strpos keyword
Nowadays, network information supervision is very strict, especially blocking keywords. Especially in the current WEB2.0 era, almost all website content comes from netizens and can be managed by the webmaster. If you want others to prohibit publishing a certain keyword on your site, you need to do it in advance. There are various functional styles for using PHP to block keywords. For example, regular expression is the most common one. I will not list them one by one here. This article introduces the function of using the PHP function strpos to block keywords.
Things:
1. Write the keywords specifically in a text file, one per line. There is no limit to the number. Write as many as you want.
2. PHP reads the keyword text and stores it in an array
3. Traverse the keyword array and use the strpos function one by one to see if there are keywords in the content. If there are keywords, return true, if not, return false.
The PHP code is as follows:
/**
* Use strpos function to filter keywords in PHP
* Helper’s Home
*/
// Keyword filter function
function keyWordCheck($content){
// Remove white space
$content = trim($content);
//Read keyword text
$content = @file_get_contents('keyWords.txt');
// Convert to array
$arr = explode("n", $content);
// Traversal detection
for($i=0,$k=count($arr);$i<$k;$i++){
// If the array element is empty, skip this loop
If($arr[$i]==''){
Continue;
}
// If a keyword is detected, return the matching keyword and terminate the operation
If(@strpos($str,$arr[$i])!==false){
//$i=$k; return $arr[$i];
}
// Return false if no keyword is detected
Return false;
}
$content = 'Here is the text content to be published. . . ';
// Filter keywords
$keyWord = keyWordCheck($content);
// Determine whether the keyword exists
if($keyWord){
echo 'The content you posted contains keywords'.$keyWord;
}else{
echo 'Congratulations! By keyword detection';
// You can perform the operation of the database to complete the release action.
}
After writing the code, I deliberately wrote a keyword content in the variable $content, and then ran it and found that no keyword was detected. The execution result was a pass, and other prohibited keywords passed.
Depressed, I started to judge whether there was something wrong.
Encoding problem? Immediately open the keyWord.txt file again with Notepad, and then save it in UTF-8 format. The result still didn't work.
Didn’t get the text content of keyWord.txt? Immediately print_r() found that it was read normally and converted into an array line by line.
So, I declared the keyword array directly in the program:
/**
* Use strpos function to filter keywords in PHP
* Helper’s Home
*/
// Keyword filter function
function keyWordCheck($content){
// Remove white space
$content = trim($content);
//Read keyword text
//$content = @file_get_contents('keyWords.txt');
// Convert to array
//$arr = explode("n", $content);
// Declare the keyword array directly in the program
$arr = array('Keyword 1','Keyword 2','Keyword 3','Keyword 4'...);
// Traversal detection
for($i=0,$k=count($arr);$i<$k;$i++){
// If the array element is empty, skip this loop
If($arr[$i]==''){
Continue;
}
// If a keyword is detected, return the matching keyword and terminate the operation
If(@strpos($str,$arr[$i])!==false){
//$i=$k; return $arr[$i];
}
// Return false if no keyword is detected
Return false;
}
$content = 'Here is the content to be published, containing keyword 2';
// Filter keywords
$keyWord = keyWordCheck($content);
// Determine whether the keyword exists
if($keyWord){
echo 'The content you posted contains the keyword ['.$keyWord.']';
}else{
echo 'Congratulations! By keyword detection';
// You can perform the operation of the database to complete the release action.
}
// Program execution result: The content you posted contains the keyword [Keyword 2]
// The program is normal
If you declare an array of keywords in PHP, it works, but if you read a text file, it doesn't work. What the heck?
After adding the trim() function to filter out the blanks, the test passed. It turned out that the problem was here after messing around for a long time.
/**
* Use strpos function to filter keywords in PHP
* Helper’s Home
*/
// Keyword filter function
function keyWordCheck($content){
// Remove white space
$content = trim($content);
//Read keyword text
$content = @file_get_contents('keyWords.txt');
// Convert to array
$arr = explode("n", $content);
// Traversal detection
for($i=0,$k=count($arr);$i<$k;$i++){
// If the array element is empty, skip this loop
If($arr[$i]==''){
Continue;
}
// If a keyword is detected, return the matching keyword and terminate the operation
// This time I added the trim () function
If(@strpos($str,trim($arr[$i]))!==false){
//$i=$k; return $arr[$i];
}
// Return false if no keyword is detected
Return false;
}
$content = 'Here is the text content to be published. . . ';
// Filter keywords
$keyWord = keyWordCheck($content);
// Determine whether the keyword exists
if($keyWord){
echo 'The content you posted contains keywords'.$keyWord;
}else{
echo 'Congratulations! By keyword detection';
// You can perform the operation of the database to complete the release action.
}
$test = "whello world";
print (strpos($text,"w"));return 0
print(strpos($text,"w",1 ));return 7
http://www.bkjia.com/PHPjc/867247.html
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1672
14
1428
52
1332
25
1276
29
1256
24
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
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.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
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
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
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.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
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.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
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.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
