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有两种做法 一种是在PHP.ini中开启outbuffer output_buffering默认值为0 可以设置为Off或者On 如果要限制输出缓冲区的最大值，可将该选项设定为指定的最大字节数（例如 output_buffering=4096）。 另一种PHP无法修改header信息方法是在PHP脚本中做开启： ...

The trick that makes it possible to capture PHP's output in a variable essentially consists of engaging the interpreter's output buffer (disabled by default) by calling ob_start ().