Picking up specific text from a text file using PHP

Question

I was wondering if you have how to get a specific text from a txt file using php ?

I can already read this to display it completely as a result in a div, but I needed to take for example a word or a number to display separately in another location. You can do this in PHP or using Javascript ?

Below is my div where displays the results that run the PHP script that reads the text file:

<div id="box_results">
    <div id="results" class="results">
      <?php
        //Abrimos o arquivo em leitura
        $arquivo = 'log/speedtest.txt';
        $fp = fopen($arquivo, 'r');

        //Lemos o arquivo
        $texto = fread($fp, filesize($arquivo));

        //Transformamos as quebras de linha em etiquetas <br>
        $texto = nl2br($texto);

        echo $texto;
      ?>
    </div>  
  </div>

I ask this because this text file is temporary, it is generated every time a form is submitted, ie it updates the information in this text file. And for the results to be displayed after submitting a form, I use the following script:

<script type="text/javascript">
$("#frm").on("submit", function(){
    $("#results").html('');
    fun();
});

var t; 

function recarrega() {
    $("#box_results").load(" #results");
    $("#execute").hide();
} 

function fun() {
    t = setInterval(recarrega, 1000);
} 

function stop() {
    clearTimeout(t);
    $("#execute").show();
}
</script>

You can then pick up specific content after this text file is updated ?

Edit:

This is the contents of the text file I will read:

[Parâmetros]
CPU = 512
WAN = 1237
LAN1 = 435

Answer 1

You can use the file_get_contents along with the function strpos.

It would be something like this:

if (strpos(file_get_contents($arquivo), 'palavra_a_ser_procurada') !== false)  {
  echo 'found';
}

• The file_get_contents transforms the file text into a string, can be worked as such in PHP.

• The strpos serves for you to find the position of the first occurrence of a word within a string. You can also check the position that the string was found inside the text, as per you can see in the manual in the link below.

• To pick up part of the text you can use functions like the substr().

As you said you will take data from the machine, such as CPU, for example, you can create a function that identifies if you find the CPU word inside the file and, if you find it, it informs the position and based on it you can get x letters in front of the substr.

Functions manual in the PHP page so you can better understand and assemble your code:

https://www.php.net/manual/en/function.file-get-contents.php

https://www.php.net/manual/en/function.strpos.php

https://www.php.net/manual/en/function.substr.php