How to determine the size of several numbers in php

Judgment method: 1. Use comparison operators "", "=", for example "$a>$b", if "$a " is greater than "$b", then TRUE is returned; 2. Use the comparison function strcmp(), the syntax is "strcmp(number 1, number 2)". If the return value is greater than 0, then number 1 is greater than number 2. If 0 is returned, the two numbers are equal. .

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php determines the size of several numbers

Method 1: Use the comparison operators "", " =”

Example	Name	Description
$a < ; $b	小与	If the value of $a is less than the value of $b, return TRUE, otherwise return FALSE
$a > $b	is greater than	If the value of $a is greater than the value of $b, return TRUE, otherwise return FALSE
$a	Less than or equal	If the value of $a is less than or equal to the value of $b, return TRUE, otherwise return FALSE
$a > = $b	Greater than or equal	If the value of $a is greater than or equal to the value of $b, return TRUE, otherwise return FALSE

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a = 10;
$b = 8;
if($a > $b){
    echo &#39;$a 大于  $b<br>&#39;;

}else{
    echo &#39;$a 小于 $b<br>&#39;;
}
?>

Method 2: Use the comparison function strcmp()

strcmp() function can compare two Binary-safe comparison of strings.

strcmp(数1, 数2)

The strcmp() function will return different values ​​based on the comparison result:

• If number 1 is less than number 2 , then return value ;

• If number 1 is greater than number 2, then return value > 0;

• If number 1 is equal to number 2, then 0 is returned.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
echo strcmp(1, 2)."<br>";
echo strcmp(23, 2)."<br>";
echo strcmp(1, 1)."<br>";
?>

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