php 笔记。忘记叫什么表达式了

eq相等 ne、neq不相等，
gt大于， lt小于
gt大于， lt小于
gte、ge大于等于  
lte、le 小于等于  
not非   mod求模  
is [not] div by是否能被某数整除  
is [not] even是否为偶数  
is [not] even by $b即($a / $b) % 2 == 0  
is [not] odd是否为奇  
is not odd by $b即($a / $b) % 2 != 0
示例：
equal/ not equal/ greater than/ less than/ less than or equal/ great than or equal/后面的就不用说了