How to output the php program?

How to output the php program? In PHP, you can use echo statement, print statement, printf(), print_r(), var_dump() to achieve output. Let's take a look at these output methods, hoping to help everyone.

echo statement

echo is a language structure, with or without parentheses Use of brackets: echo or echo() can be used for output. It is the most commonly used output statement. Example:

<?php
echo "PHP中文网";
echo ("www.php.cn");
?>

Output:

Description: In normal times, the output of echo or echo() is the same, only when multiple parameters are passed to Echo statement, when outputting, using parentheses will generate a parsing error.

print statement

The print statement can also achieve output and has a return value. It returns 1 on success and 0 on failure; therefore it can be used in expressions.

<?php
print "hello "；
print ("world！");
?>

Note: The print statement can also be used with or without parentheses, there is not much difference.

Output:

printf()

The printf() function can also be used To achieve output, you can output ordinary strings and formatted output. Example:

<?php
$a=20;
printf("输出：");
printf("a=%f",$a);
?>

Output:

print_r()

print_r() Functions are used to output variables and can display information about this variable in a format that is easy for humans to read.

<?php
$a = array (&#39;a&#39; => &#39;apple&#39;, &#39;b&#39; => &#39;banana&#39;, &#39;c&#39; => array (&#39;x&#39;,&#39;y&#39;,&#39;z&#39;));
echo "<pre class="brush:php;toolbar:false">";
print_r ($a);
echo "

"; ?>

Output:

var_dump()

var_dump() function For output variables, you can display the structured information of the variable, such as type and value.

<?php
$var_name=array(99,&#39;w3resource&#39;,67899.99, array(&#39;X&#39;,&#39;Y&#39;,1));
var_dump($var_name);
?>

Output:

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