PHP automatically identifies the Echo or dump_php tutorial based on the type of variable

Source: Internet
Author: User
Tags scalar
Sometimes we want to output the variables in the characters we may use Dump_var but if we want to output automatically, we need to liquidated the function.
copy code

"!--? php
function show_var ($var) { Br>if (Is_scalar ($var)) {
echo $var;
} else {
Var_dump ($var);
}
}
$pi = 3.1416;
$proteins = Array ("Hemoglobin", "cytochrome c oxidase", "ferredoxin");

Show_var ($PI);
//print: 3.1416

Show_var ($proteins)
//print:
//Array (3) {
//[0]=>
//String (Ten) "hemoglobin"
//[1]=>
// String "Cytochrome c oxidase"
//[2]=>
//String (Ten) "ferredoxin"
//}
?


Describe
BOOL Is_scalar (mixed $var)
If the given variable parameter var is a scalar, is_scalar () returns TRUE, otherwise FALSE is returned.

Scalar variables are variables that contain an integer, float, String, or Boolean, while array, object, and resource are not scalars.


Note:

Although the current resource types are in integers, is_scalar () does not treat them as scalars, because resources are abstract data types. The execution details cannot be relied upon, as it may change.

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