如果字符串可以转换为整数，如何检查PHP？

Question

例如，“000”，“404”和“0523”可以在PHP中转换为整数，但是“42sW”和“423 2343”不能转换为整数。

Answer 1

Use the ctype_digit function. is_numeric will also permit floating point values.

$numArray = array("1.23","156", "143", "1w");
foreach($numArray as $num)
{
    if (ctype_digit($num)) {
            // Your Convert logic
        } else {
            // Do not convert print error message
        }
    }
}

Answer 2

PHP's is_numeric() can determine if a given param is a number or a number string . Have a read through the manual for some examples.

Answer 3

ctype_digit应该是您正在寻找的。

Answer 4

use is_numeric() :

if (is_numeric("string")) {
    echo "This can be converted to a number";
}

Answer 5

$test = "42sW";
if (ctype_digit($test)) {
        echo "The string $test consists of all digits.\n";
    } else {
        echo "The string $test does not consist of all digits.\n";
    }

//OR
is_numeric($test);   // false

Answer 6

42Sw可以使用intval（）转换为数字

      echo intval("42sW"); // prints 42

Answer 7

You could try something like this.

<?php
if (is_numeric($string)) {
//functions here
}
else{
//functions2 here
}
?>