要用php守护另一个php进程(apache模块的运行的,还有nginx等运行的除外)
a.php要守护b.php
在b.php中 通过 getmypid()函数获取当前进程的id,并将id写入c.pid文件中,如果程序执行完成将c.pid文件删除或清空
在a.php中 验证c.pid是否存在 ,是否为空,如果不为空,将pid读出,通过exec执行 ps -p pid|grep 文件名来判断是否运行,判断后执行相应操作
可能有人要问,为什么不直接 ps aux|grep 文件名,这里主要是考虑到文件重名的情况下会出问题
a.php 代码
$id=intval($argv[1]);
if(!file_exists(‘pid'.$id.'.pid')){
echo “not run”;
exit;
}
$content=file_get_contents(‘pid'.$id.'.pid');
if(empty($content)){
echo “not run”;
exit;
}
exec(“ps p “.$content.'|grep b.php',$pids);
if(count($pids)>0) echo(‘runing');
else{echo ‘not run';}
?>
b.php代码
$id=intval($argv[1]);
if(empty($id))exit;
file_put_contents(‘pid'.$id.'.pid',getmypid());
while(1){
file_put_contents(‘pid'.$id.'.pid',getmypid());
sleep(100);
}
?>

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 originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

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.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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