How to convert php array page to js array

Preface

PHP arrays are very common in front-end development. If you want to convert a PHP array into a JavaScript array, the most common method is to convert it into JSON format and then parse it into a JavaScript object or array. But sometimes we want to directly convert a PHP array into a JavaScript array without parsing JSON. What should we do in this case? This article will introduce you to a simple method.

Conversion method

To convert a PHP array into a JavaScript array, you need to use some string manipulation functions. First, we need to convert the PHP array into string form, then intercept the array part, and finally parse the string into an array in JavaScript.

Here is a sample PHP array:

$colors = array("red", "green", "blue");

We need to convert this to a JavaScript array:

var colors = ["red", "green", "blue"];

So how do we do that? Let’s introduce it in detail below.

1. Convert PHP array to string

We can use implode() function in PHP to convert PHP array into comma separated string. The following is a sample code:

$colors = array("red", "green", "blue");
$str = implode(",", $colors);

The string is separated by commas here because it needs to be separated into an array in the next step.

2. Intercept the array part in the string

Now, we need to intercept the array part in the string. We can do this using the regular expression function preg_match() in PHP. The following is a sample code:

preg_match("/\[.*\]/", $str, $match);

The regular expression here (/\[.*\]/) is used to match any characters within square brackets, so $match is what we need Array part.

3. Convert string array to JavaScript array

The last step is to convert the string array in $match into a JavaScript array. We can do this using JavaScript’s eval() function. The following is sample code:

var colors = eval("<?php echo $match[0]; ?>");

Here the PHP variable $match[0] is output to JavaScript and parsed into a JavaScript array using the eval() function.

Complete sample code

The above steps have been explained clearly, and the following is the complete sample code:

$colors = array("red", "green", "blue");
$str = implode(",", $colors);
preg_match("/\[.*\]/", $str, $match);
echo "<script>var colors = eval('$match[0]');</script>";

This realizes the function of converting a PHP array into a JavaScript array .

Notes

Although this method can quickly convert PHP arrays into JavaScript arrays, there are some considerations.

1. Security

You need to pay special attention when using the eval() function, it may execute some malicious code, causing security issues. Therefore, we need to ensure that the PHP variables output to eval() are trusted.

2. Compatibility

Some browsers do not support the eval() function, so compatibility needs to be determined before use.

Summary

This article introduces a method to quickly convert PHP arrays into JavaScript arrays, and reminds everyone to pay attention to the security and compatibility issues of the eval() function. I hope to be helpful.

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