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Deeply understand the difference between ob_flush and flush in php

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WBOYOriginal
2016-07-25 08:58:56992browse
  2. ob_start();
  3. echo '1';
  4. ob_flush();//Output the php cache and refresh it
  5. echo '2';
  6. ob_flush();//Output the php cache and refresh it
  7. $cc = ob_get_contents();
  8. ob_end_clean();
  9. var_dump($cc);
  10. ?>
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output: 12string(0) ""

Test 2:

  2. ob_start();
  3. echo '1';
  4. flush(); //Output apache cache and refresh it
  5. echo '2';
  6. flush(); //Output apache cache and Refresh
  7. $cc = ob_get_contents();
  8. ob_end_clean();
  9. var_dump($cc);
  10. ?>
Copy code

output: string(2) "12"

Test 3:

  2. ob_start();
  3. echo '1';
  4. ob_flush();//Output php cache and refresh
  5. flush();//Output apache cache and refresh
  6. echo '2' ;
  7. ob_flush();//Output php cache and refresh
  8. flush(); //Output apache cache and refresh
  9. $cc = ob_get_contents();
  10. ob_end_clean();
  11. var_dump($cc);
  12. ?>
Copy code

Output: 12string(0) ""

Test 4,

  2. ob_start();
  3. echo '1';
  4. flush();//Output apache cache and refresh
  5. ob_flush();//Output php cache and refresh
  6. echo '2' ;
  7. flush();//Output apache cache and refresh
  8. ob_flush(); //Output php cache and refresh
  9. $cc = ob_get_contents();
  10. ob_end_clean();
  11. var_dump($cc);
  12. ?>
Copy code

Output: 12string(0) ""



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