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<?php $s = fopen('php://memory', 'r+'); fflush($s); var_dump(fflush($s)); $s = fopen('php://memory', 'r'); var_dump(fflush($s));
Output for 5.1.4 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
bool(true) bool(true)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.3
Warning: fopen(php://memory): failed to open stream: Inappropriate ioctl for device in /in/DNnX4 on line 3 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 4 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 5 bool(false) Warning: fopen(php://memory): failed to open stream: Inappropriate ioctl for device in /in/DNnX4 on line 6 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 7 bool(false)
Output for 4.3.5 - 4.3.11, 4.4.0 - 4.4.9
Warning: fopen(php://memory): failed to open stream: Success in /in/DNnX4 on line 3 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 4 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 5 bool(false) Warning: fopen(php://memory): failed to open stream: Success in /in/DNnX4 on line 6 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 7 bool(false)
Output for 4.3.3 - 4.3.4
Warning: fopen(php://memory): failed to open stream: Success in /in/DNnX4 on line 3 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 4 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 5 NULL Warning: fopen(php://memory): failed to open stream: Success in /in/DNnX4 on line 6 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 7 NULL
Output for 4.3.2
Warning: fopen(php://memory): failed to open stream: Inappropriate ioctl for device in /in/DNnX4 on line 3 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 4 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 5 NULL Warning: fopen(php://memory): failed to open stream: Inappropriate ioctl for device in /in/DNnX4 on line 6 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 7 NULL
Output for 4.3.0 - 4.3.1
Warning: fopen(php://memory) [http://www.php.net/function.fopen]: failed to create stream: Inappropriate ioctl for device in /in/DNnX4 on line 3 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 4 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 5 NULL Warning: fopen(php://memory) [http://www.php.net/function.fopen]: failed to create stream: Inappropriate ioctl for device in /in/DNnX4 on line 6 Warning: fflush(): supplied argument is not a valid stream resource in /in/DNnX4 on line 7 NULL

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