Detailed explanation of usage examples of ob_get_length buffer function in PHP

file_get_contents() function reads the entire file into a string. It is the same as file(). The difference is that file_get_contents() reads the file into a string.

The file_get_contents() function is the preferred method for reading the contents of a file into a string. If the operating system supports it, memory mapping technology will also be used to enhance performance.

Syntax: file_get_contents(path,include_path,context,start,max_length)

ob_start();          //打开缓冲区 
echo "hello";         //输出内容 
$out1= ob_get_contents();      //获得缓冲区内容 
echo "world";         //输出内容 
$out2=ob_get_contents();       //再次获得缓冲区内容 
ob_end_clean();        //清空缓冲区，并关闭 
echo $out1;         //输出第一次获得的结果 
echo "<br>"; 
echo $out2;         //输出第二次获得的结果，以比较

This code is used when the output buffering is set to on (output_buffering=on)

List the output header information: print_r(ob_list_handlers());

Refresh the buffer data, return the data and close the buffer: $buffer=ob_get_flush();

Write the buffer data to the file:file_put_contents('buffer.txt',$buffer);

List the output header information: print_r(ob_list_handlers());

Get the buffer length, example code As follows:

//打开缓冲区 
ob_start(); 
//输出内容 
echo "hello "; 
//获取缓冲区长度 
$len1=ob_get_length(); 
//再输出内容 
echo "world"; 
//再次获取缓冲区的长度 
$len2=ob_get_length(); 
//清空缓冲区，并关闭缓冲 
ob_end_clean(); 
//输出第一次获取的长度 
echo $len1; 
echo "<br>"; 
//输出第二次获取的长度以比较两次不同的结果 
echo $len2;

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