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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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