php.exe（WAMP）无法分配超过1G的内存，即使内存_limit设置为-1

Since a few days, I cannot update my Symfony projects using Composer because the php.exe process from my WAMP install cannot allocate more than 1G of memory... I don't recall making any changes in my PHP settings.

In the php.ini (yes, the correct one), I've set memory_limit to -1. My composer diagnose is all set to OK.

• My PHP version is 5.6.18
• My WAMP version is 3.1.3
• My OS is Windows 7
• My Composer version is 1.6.5

Could it come from a Windows setting?

Here is the error message I get :

Fatal error: Out of memory (allocated 1397751808) (tried to allocate 268435456 bytes) in phar://C:/wamp/www/DESiwid/composer.phar/src/Composer/DependencyResolver/Solver.php on line 220
Segmentation fault

I have the same kind of error with a PHP test standalone script that I have coded to allocate :

set memory_limit to 810M
memory limit is 810M
try allocating 800 megabyte...pass.Usage: 800.5 Peak: 800.5
memory_limit (get value):849346560
set memory_limit to 860M
memory limit is 860M
try allocating 850 megabyte...pass.Usage: 850.5 Peak: 850.5
memory_limit (get value):901775360
set memory_limit to 910M
memory limit is 910M
try allocating 900 megabyte...pass.Usage: 900.5 Peak: 900.5
memory_limit (get value):954204160
set memory_limit to 960M
memory limit is 960M
try allocating 950 megabyte...
Fatal error: Out of memory (allocated 262144) (tried to allocate 996147201 bytes
) in C:\wamp\www\_test\memory.php on line 5