How to convert array to number in php

How to convert php array to number: first create a PHP sample file; then define a number method; finally implement the array conversion through "var num=arr3[i]*Math.pow(10,i)" Just numbers.

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Method to convert a numeric array into a pure number

For example, change ["1", "2", "3"] to 123;

function number(a){ 　　var sum=0 　　var arr3=a.reverse(); 　　for(var i=0;i
        

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Example: var arr = [123];

number (arr);//123

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