PHP ob_get_level()用法及代码示例

ob_get_level() 函数是 PHP 中的内置函数，用于获取嵌套级别中的当前输出缓冲区级别。输出缓冲是 PHP 中的一项函数，允许您在将输出发送到浏览器或客户端之前捕获和操作输出。

用法

ob_get_level(): int

参数

该函数不接受任何参数。

返回值

ob_get_level() 函数返回一个整数值，表示输出缓冲的当前值。

程序1:下面的程序演示了ob_get_level()函数。

PHP


<?php 
ob_start(); 
  
$bufferingLevel = ob_get_level(); 
  
// Output some content 
echo "This is content inside the buffer."; 
  
// Start a new output buffer 
ob_start(); 
  
// Get the new output buffering level 
$bufferingLevelNew = ob_get_level(); 
  
// Output more content inside the new buffer 
echo "This is content inside the new buffer."; 
  
// End the new buffer 
ob_end_flush(); 
  
// Check the output buffering level 
// after ending the new buffer 
$bufferingLevelAfterEnd = ob_get_level(); 
  
// End the original buffer 
ob_end_flush(); 
?>

输出：

This is content inside the buffer.This is content inside the new buffer.

程序2:下面的程序演示了ob_get_level()函数。

PHP


<?php 
// Start output buffering 
ob_start(); 
  
// Function to check output buffering level 
// and perform actions accordingly 
function checkOutputBufferLevel() 
{ 
    $bufferingLevel = ob_get_level(); 
  
    // Display the output buffering level 
    echo "Output buffering level: " . $bufferingLevel . "<br>"; 
  
    // Perform actions based on the output buffering level 
    if ($bufferingLevel === 1) { 
        echo "You are in the top-level buffer.<br>"; 
    } elseif ($bufferingLevel > 1) { 
        echo "You are in a nested buffer.<br>"; 
    } else { 
        echo "Output buffering is not active.<br>"; 
    } 
} 
  
checkOutputBufferLevel(); 
  
echo "This is content inside the buffer.<br>"; 
  
ob_end_flush(); 
?>

输出：

Output buffering level: 1
You are in the top-level buffer.
This is content inside the buffer.

参考： https://www.php.net/manual/en/function.ob-get-level.php

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