采集guzzlehttp POST数据内容是乱码，如何解决

Question

正常表单提交是这样的数据，可以有序的排列
sell_fillOrKill = false
sell_immediateOrCancel = true
buy_fillOrKill = false
buy_immediateOrCancel = true
hideDust=true
testMode=false

但我用guzzlehttp POST 提交后就变成了
%23sell_options%0D%0Asell_fillOrKill_=+false%0D%0Asell_immediateOrCancel+%3D+true%0D%0A%23buy+options%0D%0Abuy_fillOrKill+%3D+false%0D%0Abuy_immediateOrCancel+%3D+true%0D%0AhideDust%3Dtrue%0D%0AtestMode%3Dfalse
我用的是<<<EOF来定义数据，采集用的是text/plain
$data=
<<<EOF
sell_fillOrKill = false
sell_immediateOrCancel = true

EOF;

求助，我该如何解决，还有POST的时候会把GET的参数也当POST的数据拼加在一起了