What are the types of commonly used output statements in PHP?

There are three types of output statements in PHP: echo, print and printf. Echo is used to output variable values ​​or strings. The syntax is echo $variable1, $variable2, ..., $variableN;. Print is used to output variable values ​​or strings, and the syntax is print $variable;. printf is used to format output, the syntax is printf($format, $arg1, $arg2, ..., $argN);, where $format is the format string, $arg1, $arg2, ... are output variables.

Commonly used output statement types in PHP

There are three commonly used output statement types in PHP:

• echo
• print
• printf

echo

Purpose: Used to output the value or string of one or more variables to the screen.

Syntax:

<code class="php">echo $variable1, $variable2, ..., $variableN;</code>

Example:

<code class="php"><?php
echo "Hello world!";
echo $name, " is ", $age, " years old.";
?></code>

print

Use: Similar to echo, used to output the value of a variable or a string to the screen.

Syntax:

<code class="php">print $variable;</code>

Example:

<code class="php"><?php
print "Hello world!";
print $name . " is " . $age . " years old.";
?></code>

printf

Use: Used to format output, allowing you to specify the output format and type.

Syntax:

<code class="php">printf($format, $arg1, $arg2, ..., $argN);</code>

Parameters:

• $format: Specify the output Format string containing placeholders (%s, %d, etc.) for variables to output.
• $arg1, $arg2, ..., $argN: Variables to be output.

Example:

<code class="php"><?php
printf("Hello %s, you are %d years old.\n", $name, $age);
?></code>

Output:

<code>Hello John, you are 30 years old.</code>

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