PHP string operation judgment example analysis for negative values

This article mainly introduces the judgment of negative values ​​​​in PHP string operations. The example analyzes the judgment skills of negative values ​​​​in PHP string operations. Friends in need can refer to it.

The details are as follows:

$a = '-1';
$b = (int)$a;
$c = is_numeric($a);
if ($a) {
 echo 1; //echo 1
} else {
 echo 2;
}
var_dump($b); // int(-1)
var_dump($c); // true

The running result output is as follows:

1
int -1
boolean true

Summary:

The logical value of the string '-1' is true;

Summary: The above is all of this article Content, I hope it will be helpful to everyone’s study.

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