What does variable output start with in php?

PHP variable output prefix is ​​used to specify the output variable type, including: echo: output variable value print: similar to echo, but only outputs one value printf: formatted output variable sprintf: returns a formatted string var_dump: Output variable details

PHP variable output prefix

In PHP, variables need to be added before output A prefix that indicates the type of variable to output.

Common variable output prefixes include the following:

• echo: Output variable value without any modification
• print: Similar to echo, but only outputs one value
• printf: Formatted output variables, you can specify the format string
• sprintf: Return the formatted string without directly outputting
• var_dump: Output the detailed information of the variable, including data type and value

For example :

$name = "John Doe";

echo $name; // 输出 "John Doe"
print $name; // 也输出 "John Doe"
printf("My name is %s", $name); // 输出 "My name is John Doe"

In actual use, choose the appropriate output prefix as needed. echo and print are for simple output; printf and sprintf are for formatted output; var_dump is for debugging and viewing variable details.

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