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This article explains how to write to the console in PHP.

console.log()Writing to the console using JavaScript from PHP

We can write to the console using some JavaScript from PHP. We use in JavaScript console.log()to write anything to the console. We can echoprint from JavaScript in PHP using the print statement console.log(). If we use a PHP variable as console.log()an argument to then the contents of the variable will be written to the console. We can use is_array()the print function to check if the variable to be printed is an array. If the element is an array, we can concatenate the array elements into a single string using the concatenate function with ,as a delimiter .implode()

For example, create a function write_to_console()that takes one argument $data. $dataStore the variable in a new variable $console. Use is_array()the function to check $consoleif the variable is an array. If the variable is an array, use implode()the function ,to concatenate the array elements using and as a separator. Store the value in $consolethe variable. Then, scriptinside the tag, log the variable using console.log()the statement $console. Then echoprint the JavaScript code using the statement. Outside the function, call the function with two different arguments write_to_console(). Provide a string Hello World!as the first argument and an array [1,2,3]as the second argument.

When we go to the web page and Inspect Elementcheck the console from the Options, we can see the data written to the console. This way, we can use helper functions in PHP to write to the console.

Sample code:

<?php

function write_to_console($data) {
 $console = $data;
 if (is_array($console))
 $console = implode(',', $console);

 echo "<script>console.log('Console: " . $console . "' );</script>";
}
write_to_console("Hello World!");
write_to_console([1,2,3]);

?>

Output:

Console: Hello World! 
Console: 1,2,3

console.log()Writing to the console using JavaScript and json_encode()functions in PHP

We can write to the console in PHP using json_encode()the function and JavaScript . The function converts a given associative array into a JSON object and converts an indexed array into a JSON array. We can use this function for those data items that need to be written to the console.console.log()json_ecode()

For example, create a $datafunction with an argument write_to_console(). Inside the function, apply json_encode()the function to $datathe variable and console.loglog it using . Turn the entire expression into a string and save it in $consolethe variable. Then, sprintf()print the variable using the function sprintf('<script>%s</script>', $console);and assign the expression to the variable $console. Finally, echoprint $consolethe variable using the statement. Outside the function, $datacreate an associative array on the variable and $dayscreate an indexed array on the variable. Then, call the function using these two variables as arguments write_to_console().

Associative arrays are written as JSON objects and indexed arrays are written as JSON arrays in the console. This is how we json_encode()write to the console in PHP using the function.

Sample code:

<?php
function write_to_console($data) {

 $console = 'console.log(' . json_encode($data) . ');';
 $console = sprintf('<script>%s</script>', $console);
 echo $console;
}
$data = [ 'foo' => 'bar' ];
$days = array("Sun", "Mon", "Tue");
write_to_console($data);
write_to_console($days);
?>

Output:

Object { foo: "bar" }
Array(3) [ "Sun", "Mon", "Tue" ]