What language structure can be used for the output of variables in php

Output variables in PHP can use six language structures: echo(), print(), print_r(), var_dump(), printf() and sprintf(). The selection criteria are: echo() and print() for simple output; print_r() and var_dump() for output of complex data structures; printf() and sprintf() for formatted output.

Language structure for variable output in PHP

The following language structure can be used to output variables in PHP:

1. echo()

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

2. print()

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

3. print_r()

In addition to outputting the value of the variable, print_r() also outputs the type and structure of the variable, which is suitable for outputting complex data structures.

<code class="php">print_r($array);</code>

4. var_dump()

is similar to print_r(), but more detailed. It outputs the complete information of the variable, including its type, Value and reference counting.

<code class="php">var_dump($variable);</code>

5. printf()

is used to format output and can specify output format and modifiers.

<code class="php">printf("变量的值是 %s", $variable);</code>

6. sprintf()

is similar to printf(), but returns the formatted output as a string instead of Output directly to the screen.

<code class="php">$output = sprintf("变量的值是 %s", $variable);</code>

Guidelines for choosing language constructs:

• echo() and print() are used for simplicity output.
• print_r() and var_dump() are used to output complex data structures.
• printf() and sprintf() are used for formatted output.

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