How to determine whether a positive number is positive in php

How to judge whether a positive number is positive in php: 1. Judgment through regular expressions; 2. Judgment combined with floor function; 3. Judgment through functions such as is_numeric.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How does PHP determine whether it is a positive number?

php determines whether a variable is a positive integer

Method one:

if(preg_match("/^[1-9][0-9]*$/" ,$amount)){
 die('是正整数');
}

Method two:

$ num = '45 .7' ;
if（（floor（$ num）- $ num）！== 0）{
  exit（“ 不是正整数！”）;
} else {
  exit（“ 是正整数！”）;
}

Method three:

$ num = '12' ;
if（floor（$ num）== $ num）{
  exit（“ 是正整数！”）;
} else {
  exit（“ 不是正整数！”）;
}

Method 4:

if（！ is_numeric（$ jp_total）|| strpos（$ jp_total ，“。”）！== false）{
  die（“ 不是整数”）;
} else {
  die（“ 是整数”）;
}

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to determine whether a positive number is positive in php. For more information, please follow other related articles on the PHP Chinese website!