Description:
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There is a strange behaveour, 
when assigning a value in an if-statement (=), 
instead of equate the variable with a value (==):

the value of the variable becomes TRUE respectively 1,
this happens only if there is another condition in the 
if-statement after assigning the variable.

Tested with PHP Version 5.6 and 7.?  

Test script:
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$var = "original value";
$var2 = 'some_value';

echo "1: ".$var."<br>";
if($var="value" || false){ echo "2: ".$var."<br>"; }  /* && or || */
if("any_true_value"==$var){echo "3: ".$var."<br>";}

Expected result:
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1: original value
2: value


Actual result:
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1: original value
2: 1
3: 1