PHP ob_get_level()用法及代碼示例

ob_get_level() 函數是 PHP 中的內置函數，用於獲取嵌套級別中的當前輸出緩衝區級別。輸出緩衝是 PHP 中的一項函數，允許您在將輸出發送到瀏覽器或客戶端之前捕獲和操作輸出。

用法

ob_get_level(): int

參數

該函數不接受任何參數。

返回值

ob_get_level() 函數返回一個整數值，表示輸出緩衝的當前值。

程序1:下麵的程序演示了ob_get_level()函數。

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(); 
?>

輸出：

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

程序2:下麵的程序演示了ob_get_level()函數。

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(); 
?>

輸出：

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

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

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