Grep command for find single equal operator in php files

Question

I want search misused php if statements with grep command in Linux /var/www directory .

//Misused--- i want to find only it
if($a=1){ echo "x"; }

//Correct
if($a==1){ echo "x"; }

Answer 1

With GNU grep:

grep -E '\bif *\( *\$[^=]+*\b=\b[^=]+\)' file

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See: The Stack Overflow Regular Expressions FAQ