PHP cache design_PHP tutorial

//This function mainly uses the file modification time function filemtime to subtract the current time to determine whether to update the content.

<?php
$cahetime=2;//Set expiration time
$cahefile="cahe.txt";//Read and write text

if(file_exists($cahefile) && time()-$cahetime< filemtime($cahefile)){

echo file_get_contents($cahefile);
}
else {
file_put_contents($cahefile,date("y-m-d H:i:s",time()));
}
?>

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