How to intercept string by word in php_PHP tutorial
php 按电影截取电影的设计
codes are as follows:
function limit_words($string, $word_limit)
{
$words = explode(" ",$string);
return implode(" ",array_splice($words,0,$word_limit));
}
//Example Usage
$content = "The truth is that the pain itself is important, it is followed by a gain, but at the same time it happens that there is a great deal of work and pain. For I will come to the bottom of it, no one should practice any kind of work unless he derives some benefit from it. he wants to be in pleasure, let him flee from pain, and let him not be born. Except those who are blinded by desire, they do not come out, they are in fault, who forsake the duties, that is, the soul is softened.";
echo limit_words($content,20);
?>

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TomodifydatainaPHPsession,startthesessionwithsession_start(),thenuse$_SESSIONtoset,modify,orremovevariables.1)Startthesession.2)Setormodifysessionvariablesusing$_SESSION.3)Removevariableswithunset().4)Clearallvariableswithsession_unset().5)Destroythe

Arrays can be stored in PHP sessions. 1. Start the session and use session_start(). 2. Create an array and store it in $_SESSION. 3. Retrieve the array through $_SESSION. 4. Optimize session data to improve performance.

PHP session garbage collection is triggered through a probability mechanism to clean up expired session data. 1) Set the trigger probability and session life cycle in the configuration file; 2) You can use cron tasks to optimize high-load applications; 3) You need to balance the garbage collection frequency and performance to avoid data loss.


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