First day of month php

$first_day = date('Y-m-01');   $last_day = date('Y-m-t');

Get next month first day php

$config_month  = 1;
$config_day = 1;

$new_expiry_date = date('Y-m-d', mktime(0, 0, 0, date('m') + $config_month, 1 + $config_day, date('Y')));

Get first day of current month php

<?php
    // First day of this month
    $d = new DateTime('first day of this month');
    echo $d->format('jS, F Y');
?>

Source: stackoverflow.com

Php get current month first date

//get first day of the current month 
$start = date("Y-m-1 00:00:00");
//get current date of the month
$end = date("Y-m-d H:i:s");

//query data for the current month so far
$query = $this->db_model->run_query("select column_1, column_2 from table where date_column BETWEEN '".$start."' AND '".$end."'");

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