PHP tips for caching using static variables

function Updatefirstendfrombatchtasks (...) { Static $cache =array (); $val =$ $cache [$key]; if (Is_null ($val)) { $val =.....//Get the value of $val $cache [$key]= $val; } } Copy Code the advantages and disadvantages of a static variable for caching : Advantages: fast speed, high efficiency, simple implementation. Because it is a PHP internal variable, it is the most efficient execution in all caches. Disadvantage: Poor flexibility, only valid in this connection, the execution area is small, only valid in the same function, cannot work across functions (can use global variable substitution). Summary: The static variable cache is very useful, and the cost of a few resources, for the database to query, and in a single connection may be executed multiple times, it may be added. Although the effect may be limited.

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