How to determine whether a value is of type int in php

php method to determine whether a value is of type int: 1. Use the is_int() function, which is used to detect whether the variable is an integer, the syntax is "is_int($var)"; 2. Use the is_numeric() function , syntax "is_numeric($var)".

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

php judgment value is Not an int type (integer)

Method 1: Use the is_int() function

is_int() function is used to detect whether the variable is an integer . Returns TRUE if the specified value is an integer, FALSE otherwise.

<?php
header("Content-type:text/html;charset=utf-8");
$var_name1=678;
$var_name2="a678";
$var_name3="678";
$var_name4=999;
$var_name5=698.99;
$var_name6=array("a1","a2");
$var_name7=+125689.66;
if (is_int($var_name1))
{
    echo "$var_name1 是整数" . "<br>";
}
else
{
echo "$var_name1 不是整数" . "<br>" ;
}
if (is_int($var_name2))
{
echo "$var_name2 是整数" . "<br>" ;
}
else
{
echo "$var_name2 不是整数" . "<br>" ;
}
$result=is_int($var_name3);
echo "[ $var_name3 是整数吗? ]" .var_dump($result) . "<br>";
$result=is_int($var_name4);
echo "[ $var_name4 是整数吗? ]" .var_dump($result) . "<br>";
$result=is_int($var_name5);
echo "[ $var_name5 是整数吗? ]" .var_dump($result) . "<br>";
$result=is_int($var_name6);
echo "[ $var_name6 是整数吗? ]" .var_dump($result) . "<br>";
$result=is_int($var_name7);
echo "[ $var_name7 是整数吗? ]" .var_dump($result);
?>

Method 2: Use is_numeric() function

is_numeric() function is used to detect whether the variable is a number or numeric character string.

<?php
header("Content-type:text/html;charset=utf-8");
$var_name1=678;
$var_name2=698.99;
$var_name3=+125689.66;
if (is_int($var_name1))
{
    echo "$var_name1 是整数" . "<br>" ;
}
else
{
echo "$var_name1 不是整数" .  "<br>" ;
}
if (is_int($var_name2))
{
echo "$var_name2 是整数" .  "<br>" ;
}
else
{
echo "$var_name2 不是整数" .  "<br>";
}
if (is_int($var_name3))
{
echo "$var_name3 是整数" .  "<br>";
}
else
{
echo "$var_name3 不是整数" .  "<br>" ;
}
?>

Note: The difference between the two functions is that when the variable is a numeric string such as '1',

• The return value of is_int() is false,

• The return value of is_numeric() is true

Recommended study: "PHP video tutorial》

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