Writing to .txt file in columns with php

问题

I have an associative array in php, for example with the values:

"apple" => "green"
"banana" => "yellow"
"grape" => "red"

My question is, how can I write the keys and values for this array to a .txt file into two perfect columns? By which I mean into two columns with a uniform distance between them all the way down

回答1:

You can use str_pad() php function for the output. http://php.net/manual/en/function.str-pad.php

Code:

<?php
$fruits = array( "apple" => "green",
                "banana" => "yellow",
                "grape" => "red" );

$filename = "file.txt";
$text = "";
foreach($fruits as $key => $fruit) {
    $text .= str_pad($key, 20)."  ".str_pad($fruit, 10 )."\n"; // Use str_pad() for uniform distance
}
$fh = fopen($filename, "w") or die("Could not open log file.");
fwrite($fh, $text) or die("Could not write file!");
fclose($fh);

Output:

apple                 green     
banana                yellow    
grape                 red       

// Getting the length dynamically version.

<?php
$fruits = array( "apple" => "green",
                "banana" => "yellow",
                "grape" => "red" );

$filename = "file.txt";

$maxKeyLength = 0;
$maxValueLength = 0;

foreach ($fruits as $key => $value) {
    $maxKeyLength = $maxKeyLength < strlen( $key ) ? strlen( $key ) : $maxKeyLength;
    $maxValueLength = $maxValueLength < strlen($value) ? strlen($value) : $maxValueLength ;
}

$text = "";
foreach($fruits as $key => $fruit) {
    $text .= str_pad($key, $maxKeyLength)."         ".str_pad($fruit, $maxValueLength )."\n"; //User str_pad() for uniform distance
}
$fh = fopen($filename, "w") or die("Could not open log file.");
fwrite($fh, $text) or die("Could not write file!");
fclose($fh);

回答2:

Maybe a long shot, but you could possible do something like find the max array key length and then use that as a guide for how many spaces you want in between the words.

eg.

You could get the max array key length using strlen() like this:

$maxLength = 0;
foreach($array as $key => $item){
  if(strlen($key) > $maxLength){
    $maxLength = strlen($key);
  }
}
$maxLength += 5; //or any spacing value here

And then use str_pad() to add padding to the word like this:

$str = '';
foreach($array as $key => $item){
  $str .= str_pad($key, $maxLength, ' ', STR_PAD_RIGHT) . $item . '\n'; //add padding to the right hand side of the word with spaces
}

file_put_contents('path/to/file', $str);

This probably isn't the best solution but you could probably make it more efficient.

回答3:

Update

I revised the functionality, and the below will work with a string (array key) of any length.

$longest = 0;
// find the longest string.
foreach ($array as $key => $val) {
    $c = strlen($key);
    $longest = ($c > $longest) ? $c : $longest;
}

$distance = 5;
$str = '';
// now loop through and apply the appropriate space
foreach ($array as $key => $val) {
    $c = strlen($key);
    $space = $distance + ($longest - $c);
    $str .= $key . str_repeat(" ", $space) . $val . "\n";
}

echo $str;

Example

---

I don't understand why you'd want to do something like this, but this will do as you desire:

$str = '';
foreach($array as $key => $item){
  $str .= $key . "\t" .$item ."\n";
}
file_put_contents('path/to/file', $str);

Example

---

^{You'd obviously have to test the file_put_contents() to ensure it succeeded, but I'll leave that to you.}

You'd just have to change the ammount of tabs (\t) if you run into any long strings. In your case, it'd probably be best if you went with 2 (\t\t).

回答4:

$Offer is your array

$file = 'people.txt';
$content = '';

foreach ($Offer as $key => $value) { 
   $content .= $key.'='.$value;
   // Write the contents back to the file
   file_put_contents($file, $current);
}

来源：https://stackoverflow.com/questions/27833521/writing-to-txt-file-in-columns-with-php