Detailed explanation of the usage of php echo

php echo is a language structure rather than a function. The function of echo is to output a string. It is a language structure with a very high usage rate. The usage syntax is such as [echo 'Welcome';]. The output result is [Welcome].

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PHP echo is strictly a language construct (language construct) Instead of a function, the function of echo is to output strings. It is a language structure with a very high usage rate, especially in systems that do not use template mode. Similar to echo, there is print. The difference between the two is not big. Normally, just use echo. In addition, since echo is not a function, it is more flexible in use. Here are several examples of different echo output methods.

PHP echo example 1. Output a single string

<?php
　echo &#39;欢迎光临&#39;;
?>

The above example output

欢迎光临

This is the most basic PHP echo application. Put it directly in single quotation marks ('') or double quotation marks (""), and connect it after echo, which means that echo will output the string in the quotation marks to the screen. You can also use parentheses to wrap the string. If To output multiple strings at one time, you need to use a connection trick. Please see Example 2.

PHP echo example two, output a combination of multiple strings

<?php
　echo &#39;您好：&#39;.&#39;欢迎光临&#39;;
?>

The above example output

您好：欢迎光临

In example two, we will The strings "Hello:" and "Welcome" are strung together through PHP's string connection symbol (.), allowing echo to output two strings at a time. The connection symbol will not appear in the output result, but a complete string.

PHP echo example three, output array elements

<?php
$NewArray=array( &#39;苹果&#39; , &#39;香蕉&#39; , &#39;水梨&#39; );
echo $NewArray[1];
?>

The above example output

香蕉

Usually to output the array elements of the entire PHP Array, print_r will be used To output, if you just want to output a single independent array value, you can use echo to complete it. For example, in the example, we only need to output bananas. It is very convenient to use echo to output. The designer or system needs to clearly know the array to be echoed. What is the key? Usually the designer will specify the array key before echoing.

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