PHP automatically identifies echo or dump according to the type of variable_PHP tutorial

Sometimes we want to output variables in characters, we may use dump_var, but if we want to output automatically, we need to calculate the function.

show_var($proteins) // Print:

The code is as follows

代码如下	复制代码
function show_var($var) { if (is_scalar($var)) { echo $var; } else { var_dump($var); } } $pi = 3.1416; $proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin"); show_var($pi); // 打印：3.1416 show_var($proteins) // 打印： // array(3) { // [0]=> // string(10) "hemoglobin" // [1]=> // string(20) "cytochrome c oxidase" // [2]=> // string(10) "ferredoxin" // } ?>

Copy code

function show_var($var) { if (is_scalar($var)) {
echo $var;

} else {

var_dump($var);

}

}
$pi = 3.1416; $proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");

show_var($pi);

// Print: 3.1416

// array(3) {

// [0]=>

// string(10) "hemoglobin"

// [1]=> // string(20) "cytochrome c oxidase" // [2]=> // string(10) "ferredoxin" // } ?> Description

bool is_scalar ( mixed $var ) is_scalar() returns TRUE if the given variable argument var is a scalar, FALSE otherwise.

Scalar variables refer to those variables containing integer, float, string or boolean, while array, object and resource are not scalars. Note: Although the current resource types are integers, is_scalar() will not treat them as scalars because resources are abstract data types. Implementation details cannot be relied upon as they may change. http://www.bkjia.com/PHPjc/629106.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629106.htmlTechArticleSometimes we want to output variables in characters. We may use dump_var, but if we want to output automatically, we need Calculate the function. The code is as follows Copy the code ?php function show_v...