Solution to the problem of data loss when posting a large amount of data in php, post data loss_PHP tutorial

Solution to data loss problem found when php post a large amount of data, post data loss

Solution:

Just increase max_input_vars in php.ini and change it to 5000

Cause tracing:

from enctype="multipart/form-data"

php version 5.6.6

Problem: Some POST data cannot be received

After tracing the source code, it was found that it was caused by the max_input_vars configuration in php;

The relevant function is rfc1867_post_handler. If the length is exceeded, safe_php_register_variable will not be called for variable registration

The relevant stack is as follows
Copy code The code is as follows:
#0 rfc1867_post_handler (
content_type_dup=0x7ff85307a5f8 "multipart/form-data; boundary=", '-' , "306141311912057",
arg=0x7ff85307ccc0) at /tmp/php-5.6.2/main/rfc1867.c:681
#1 0x00000000007a4bb0 in sapi_handle_post (arg=) at /tmp/php-5.6.2/main/SAPI.c:185
#2 0x00000000007ab72f in php_default_treat_data (arg=0, str=0x0, destArray=0x7ff85307ccc0)
at /tmp/php-5.6.2/main/php_variables.c:399
#3 0x0000000000615c91 in mbstr_treat_data (arg=0, str=0x0, destArray=0x0) at /tmp/php-5.6.2/ext/mbstring/mb_gpc.c:69
#4 0x00000000007aa9fb in php_auto_globals_create_post (name=0x7ff852f474f0 "_POST", name_len=5)
at /tmp/php-5.6.2/main/php_variables.c:741
#5 0x00000000007d63bb in zend_auto_global_init (auto_global=0x196c950) at /tmp/php-5.6.2/Zend/zend_compile.c:6832
#6 0x0000000000808a43 in zend_hash_apply (ht=0x1955cb0, apply_func=0x7d63a0 )
at /tmp/php-5.6.2/Zend/zend_hash.c:641
#7 0x00000000007aaa4e in php_hash_environment () at /tmp/php-5.6.2/main/php_variables.c:702
#8 0x000000000079bb25 in php_request_startup () at /tmp/php-5.6.2/main/main.c:1671
#9 0x00000000008a756d in main (argc=, argv=)
at /tmp/php-5.6.2/sapi/fpm/fpm/fpm_main.c:1887

where rfc1867_post_handler is php_session_rfc1867_callback

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