(PHP 4, PHP 5, PHP 7, PHP 8)
ob_get_contents — 返回输出缓冲区的内容
此函数没有参数。
此函数返回输出缓冲区的内容，或者如果输出缓冲区无效将返回 false。
示例 #1 ob_get_contents() 简单示例
<?php
ob_start();
echo "Hello ";
$out1 = ob_get_contents();
echo "World";
$out2 = ob_get_contents();
ob_end_clean();
var_dump($out1, $out2);
?>以上示例会输出：
string(6) "Hello " string(11) "Hello World"
This is an example of how the stack works:<?php//Level 0ob_start();echo "Hello ";//Level 1ob_start();echo "Hello World";$out2 = ob_get_contents();ob_end_clean();//Back to level 0echo "Galaxy";$out1 = ob_get_contents();ob_end_clean();//Just outputvar_dump($out1, $out2);?>Note that, unlike PHP variables which make efficient use of memory, getting the contents of the output buffer results in a new copy of the buffer being made. This can end up massively increasing the memory requirements of your script if your output is large.Example code:<?phpprint(memory_get_usage() . "<br>");ob_start();for ($i = 0; $i < 5000000; $i++) print(" ");print(memory_get_usage() . "<br>");$foo = ob_get_contents();print(memory_get_usage() . "<br>");ob_end_flush();?>Output: 351664 535915210359256