Add Watermark On Image in PHP- It is very easy and simple to add watermarks on images in PHP. GD library and GD functions are used for adding watermarks on image in PHP. Here in this tutorial we are going to cover two things – 1. Add Text as watermark. 2. Add Image as Watermark.

How to Add Watermark On Image in PHP?

You can add the watermark on images in following ways –

Add Text As Watermark

Three functions are used to add the text as watermark in php –

• imagecreatetruecolor– Returns an image identifier representing a black image of the specified size.
• imagecopy– Used to copy image.
• imagettftext– This is used to write the texts to the image using TrueType fonts.

Syntax

Here is the syntax for adding the text watermark on image.

imagettftext() function is main function which is responsible for adding the text watermark on the image. This function accepts the following parameters-

• $imageResource– This is obtained from the function imagecreatetruecolor().
• $fontsize– This is used to define the font size of the watermark text.
• $waterMarkAngle– This is used to define the watermark angle.
• $x, $y– $x is used to define the distance of the watermark from X axis. $y is used to define the distance from Y axis.
• $fontFilePath– This is used to add the font file path. If font file is not there then download the font file – Download Arial Font
• $watermarkText– Watermark text to be added.
• $color– This is used to add the watermark font color.

Text Watermark On Image : Example 1 –

Let us pass the font color white, angle 0 degree and font size 30px.

If you run the above example it will produce the output something like this –

Text Watermark on Image : Example 2 –

Let us pass the font color white, angle 45 degree and font size 40px.

If you run the above example it will produce the output something like this –

Add image as Watermark

Apart from texts you can also add image as watermarks. Sometimes we need some image to be used as watermark such as logo of company on each images. Php imagecopy() function is enough to add image watermarks on another image. You can add the image watermarks simply as below –

Syntax

Syntax for image watermark is as –

The above function is enough for adding the image watermark on another image.
The imagecopy function copy the source Image($srcImage) onto the destination image($dstImage). Input parameter of imagecopy() function are as –

• $dstImage– The main image on which you want to add the watermark.
• $srcImage– The image used for watermark.
• $dstX, $dstY– The x, y co-ordinates of destination image.
• $srcX , $srcY– The x, y co-ordinates of the source image.
• $srcW , $srcH– The height & width of the image to be copied. The image will be copied with a height of $srcW & Height of $srcH from the co-ordinates $srcX, $srcW And will be added onto the destination image’s co-ordinate $x, $y.

Add Image Watermark : Example –

Let us add watermark simply using the imagecopy() function as below- .

The above example will add the source image onto the destination image. If you run the above example it will produce the output something like this –

Php Delete an element from array – You can remove array element using the unset($position) function. It deletes the element at the specified position. Here in this tutorial we are going to explain how you can delete an element form an array. We will explain this with example and demo.

Php Delete an element from array

You can remove an element from array using the unset function as below –

If you run the above example it will produce output something like this-

Php delete element from array by value

You can delete the array element by value as below –

'2',"c"=>'1',"d"=>'4',"e"=>'9');
print_r($array);
$delete_value = 4;
if(($key = array_search($delete_value, $array)) !== false) {
    unset($array[$key]);
}
echo "
After Deleting
";
print_r($array);
?>

If you run the above example it will produce output something like this-

Php delete element from array by key

You can delete the array element by key as below –

'2',"c"=>'1',"d"=>'4',"e"=>'9');
print_r($array);
$key = 'c';
    unset($array[$key]);
echo "
After Deleting
";
print_r($array);
?>

If you run the above example it will produce output something like this-

The requested PHP extension ext-intl * is missing from your system : While installing magento2 via composer this error occurred. This error also appears when installing Cakephp 3. You can fix this problem by following the simple steps as below.

The requested PHP extension ext-intl * is missing from your system

Here is the screen shot of composer command –

Steps to fix the problem –

• Open php.ini located at – /xampp/php/php.ini
• Uncomment ;extension=php_intl.dll ie. remove semocolon so it will be – extension=php_intl.dll
• Restart apache from Xampp control panel.

The above solution will fix our problem.

Php save image from url : There are many ways to save images from the the given url. file_get_contents and file_put_contents can be used to save images from the given url. For using the file_get_contents allow_url_fopen should be set true. Here in this tutorial we are going to explain how you can save an image from the url.

Php save image from url

Here are the methods you can use to save the image from given url –

Php save image from url : Using file_get_contents

If allow_url_fopen is set to true you can save image from given url as below –

$url = 'http://example.com/test-image.jpg';
$content = file_get_contents($url);
file_put_contents("/folder/myimage.jpg", $content);

Suppose that your image is on given url like – ‘http://example.com/test-image.jpg’ and you want to download it. First get the content of image using the function file_get_contents($url) where url is image full url. Now to save this image use the function file_put_contents(“/folder/myimage.jpg”, $content); where ‘/folder/myimage.jpg’ is folder name where you want to save the image with the name ‘myimage.jpg’ and $content contains the image content taken from the url.

Php save image from url : Using curl

You can save image from given url using the curl as below –

$url = 'http://example.com/test-image.jpg';
$ch = curl_init($url);
$fp = fopen('/folder/myimage.jpg', 'wb');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
fclose($fp);

The above example will save the image in folder with the name ‘myimage.jpg’.

Php remove first character from string : Sometimes in few cases we need to remove first character from string in php. There are many ways to remove first character from string. Here in this tutorial we are going to explain the simplest method with example and demo.

Php remove first character from string Syntax & Example

You can use substr() function to remove the first character from string as below –

If you run the above example it will produce the output something like this –

Remove first character from string : Using ltrim

If you know the first character, you can remove the string as below using the ltrim function-

Remove first character from string : Using Regular Expression

You can remove first letter using the regular expression also as below –

If you run the above example it will produce the output something like this –

Php Convert object to Associative Array : We sometimes need to convert the php objects to associative array. An Object is converted to array which contains the keys that are member variables and values are object’s property. Here in this tutorial we are going to explain how you can convert php objects as associative array.

Php Convert object to Associative Array

Let us create a simple php object

firstName = "John";
$object->lastName = "Dee";

?>

Php objects are accessed in php as below-

firstName;
echo $object->lastName;

?>

The above example will give you the first name and last name.

Now let us convert the above php object in associative array –

Convert PHP object to Associative Array Example

firstName = "John";
$object->lastName = "Dee";

$array = (array)$object;
echo $array['firstName']."
";
echo $array['lastName']."
";
?>

$array[‘firstName’] give you the first name and $array[‘lastName’] will give you last name as associative key pair value. If you run the above example it will produce the following output –

Php Read file line by line : For large files we can’t load the full file in memory at a time which will cause memory exhaust errors. To read large file programmatically we should always follow the line by line approach. If you working with an application which has large file in GB or TB or more than that always try to read the files line by line. Here in this tutorial we are going to explain how you can read a big file line by line without causing the memory exhaust error problem.

Php Read file line by line : Read Large File

You can read a large file line by line as below –

$file = fopen("bigfile.txt", "r");
if($file){
// if the file is opened successfully 
while(!feof($file)){
    $line = fgets($file);
    //perform action with $line
}
fclose($file);
}else{
  echo "Error while opening the file.";
}

The function feof() is used to get the line no from the file. The above example will open the file and read the file bigfile.txt line by line.

Remove Last Character From String in Php : We sometimes need to remove last character from string such as comma(,), semicolon(;) etc. We can remove last character from string in php using the function substr(). There are many ways to remove last character from string we are going to explain some of them with example and demo.

Remove Last Character From String in Php

You can remove the last character using the following – method 1

Remove Last Character From String Using substr() Method 1

Using the substr() function we can remove the last character as

If you run the above example it will produce the following output –

Test

Remove Last Character From String Using rtrim() – Method 2

Using the rtrim() function we can remove the last character as

rtrim($str, “,”) – first parameter is string and second parameter is character you want to remove. rtrim() function removes the character from the right of string if the character is specified otherwise it will remove blank space if found. If you run the above example it will produce the following output –

Test