JIYIK CN >

This article will introduce the method of reading text files line by line in PHP.

fgets()Use the function to read a text file line by line in PHP

We can read a text file line by line in PHP using the whileread_line function with a loop. This function returns a line if there is one and returns false if there are no more lines to read. It takes two parameters. The syntax is as follows.fgets()

fgets($file, $length)

Here, $fileit is similar to a file pointer pointing to a successfully opened file. $lengthoptions, optional, indicates the number of bytes to read.

We can open()read the file using the function and then whileloop fgets()through each line using the loop through function. We have a text file with the following content abc.txt.

Hi
How are you
Have a great day 

For example, create a variable $txt_fileand write the function in it fopen(). rOpen the file in mode abc.txt. Create a line counter variable $aand 1assign the value to it. Then, create a whileloop. Inside the loop's brackets, write the function with $text_fileas a parameter fgets(). Assign the function to the variable inside the loop $line. Print $linethe variable, connecting it with the variable inside the loop body $a. Increment the variable and close the file stream $ausing the function outside the loop .fclose()

Sample code:

<?php
$txt_file = fopen('abc.txt','r');
$a = 1;
while ($line = fgets($txt_file)) {
 echo($a." ".$line)."<br>";
 $a++;
}
fclose($txt_file);
?>

Output:

1 Hi 
2 How are you 
3 Have a great day

file()Use the function to read a text file line by line in PHP

file()The function reads the entire file into an array. file()The syntax of the function is as follows.

file($filename, $flag, $context)

Here, $filenameis the file path to read. $flagoptions is optional and consists of various constants such as FILE_USE_INCLUDE_PATH, , FILE_IGNORE_NEW_LINESand FILE_SKIP_EMPTY_LINES. The third is also optional and defines a context resource.

file()The function returns the entire array if it exists or returns false. We can use this function foreach()to read the file line by line using the helo context of the function. foreach()The function will go through the entire content and extract each line individually.

For example, store the file path in a variable $txt_file. Write a variable $linesand store the function on it using $txt_fileas the argument . Next, use the function to loop through the contents of the file using as the iterator and as the value. Within the loop body, print the and variables.file()foreach()$lines$num=>$line$num$line

Sample code:

$txt_file = 'abc.txt';

$lines = file($txt_file);
foreach ($lines as $num=>$line)
{
 echo 'Line '.$num.': '.$line.'<br/>';
}

Output:

Line 0: Hi 
Line 1: How are you 
Line 2: Have a great day

Read a file line by line in PHP using the file_get_contents()and functionsexplode()

file_get_contents()The function reads the entire file into a string. If the content exists, it returns the entire file as a string, otherwise it returns false. We can specify the file path as a parameter to the function. explode()The function splits the string into an array using a delimiter. explode()The syntax of the function is as follows.

explode(separator, $string, $limit)

separator$stringThe option is used to separate the from the number of elements in the return value $limit. We can combine the file_get_contents(), explode(), and foreach()functions to read a text file line by line in PHP.

For example, create a variable $contentsand write the function on it using the file path in the argument file_get_contents(). Use explode()the function with \nthe character as a delimiter, $contentsas a string. Assign the function to the variable $lines. Use foreachthe loop to $linesloop over $line. Then, print inside the loop body $line.

In the following example, $contentsthe variable returns the string. We \nsplit it by newline character into an array and print each line using a loop.

Sample code:

$contents=file_get_contents("abc.txt");
$lines=explode("\n",$contents);
foreach($lines as $line){
 echo $line.'<br>';

}

Output:

Hi 
How are you 
Have a great day