How to determine whether a variable is an integer in php

Two methods for php to determine whether a variable is an integer

1. If you are sure that your variable is a number , PHP has a built-in judgment function: is_int detects whether the variable is an integer;

2. But sometimes the variables we receive are numbers or numerical strings (such as form input, they are usually strings), In this way, we cannot use the daois_int() function to simply determine whether it is an integer. We need to use the is_numeric() and strpos() functions to determine whether it is an integer:

(1) Use the is_numeric() function to determine whether it is an integer. It is a number or a string of numbers;

(2) Use strpos() to determine whether the number contains a decimal point;

if(!属is_numeric($age)||strpos($age,".")!==false){
  echo "不是整数";
}else{
  echo "是整数";
}

Recommended tutorial: "PHP Tutorial"

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